Can u pls explain this ?

option B use CIP rule to decide priority. Check the first higher priority atom if first atom is same then move on next higher priority atom and so on.

mark the priority according to cip rule. option A is correct

Simun first give the priority to the group attached to doubly bonded carbon atom. If highest priority group is present on the same side of double bond then they are 'Z' isomer. If...