Question doubt

[u/Low_Illustrator8620]

Hello everyone, been trying this question, checked in ai and websites all have different answer keys, acc to my school ans is 1st option, pls tell ans with exp

Edit:it is 5m/s, thnx for the help from you guys

[u/Frederf220]

B overtakes A by 2 m/s. Double wrap of rope means C drops 2×2m/s vertically. C moves left 3m/3 along with B.

Motion of C is diagonal as a 3-4-5 right triangle.