You . . . . . . . permission of your parents before taking this important decision.

A. should have taked

B. should have taken

C. should took

D. should have took

Answer: Option B

Solution(By Examveda Team)

Sentence is in Future perfect tense and active voice.
Rule :
Subject + modal verb + have/has + V³ + other agents.
You should have taken permission of your parents before taking this important decision.