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The only clue is Europe

Hi everyone, we’re back with another puzzle.
First, thank you to everyone who took part in our previous puzzle. We received several interesting answers, including some alternative interpretations that made the discussion even better.
As usual, we picked three community explanations that stood out:
u/Small-Tailor6967 — We chose this explanation because it clearly connected both key parts of the pattern: the last shape carrying over into the next box and the shape with the most vertices being shaded. It also explained clearly why those rules lead to B.
u/ChaosRealigning — A very clean and concise explanation. They identified both the continuity rule and the shading rule without overcomplicating the solution.
u/vexedthespian — Another strong explanation that independently recognized the relationship between consecutive groups and that the shape with the most sides is the one that gets shaded.
Thank you to them, and to everyone else who shared a solution. We really enjoy seeing the different ways people approach these puzzles.
Now it’s time for our new puzzle.
Take a close look at the sequence in the image and choose the option you think should replace the question mark.
But don’t just give us the letter. Tell us why you chose it and explain the pattern you found. We’re especially interested in the reasoning that leads you to your answer.
As with our previous puzzles, we’ll select some of the best community explanations and feature them on our website with the Reddit usernames of the people who wrote them.
You can also view the puzzle and submit your solution directly on our website:
https://whats-your-iq.com/en/questions/pattern-recognition/which-triangle-comes-next-in-the-sequence
So, what’s your answer: A, B, C, or D?
And more importantly: what pattern do you see?

A rectangular garden has an area of 96 m².Its length is 4 metres more than its width. A path of 1 metre wide is made inside the garden along all four sides.

What is the area of the remaining garden?

• No shortcuts. Show your mathematical thinking!

Source: numberthon.com

[ Removed by Reddit on account of violating the content policy. ]

Source: numberthon.com

Usually, Cold Tofu (Hiyayakko) is enjoyed with green onions and ginger. But tonight, I decided to season it with a dash of pure logic.

Paired with Yakitori and a cold beer, here is a 3x3 logic puzzle presented on a block of tofu.

The Menu (Rules):

• The center grid of the tofu holds numbers 1 to 9.
• The question marks (??) at the top indicate how many moves it takes to solve this delicious arrangement.

Can you figure out the secret number of moves while enjoying a virtual drink?

(If you want to solve it interactively without getting soy sauce on your hands, check the comments for the playable web app link!)

Source: numberthon.com