A. He was chased by a big crowd and later was arrested by the police.
B. He was chased by a big crowd and later arrested by the police.
C. He was chased by a big crowd and was later the police arrested him.
D. He was chased by a big crowd and was later arrested by the police.
Given sentence is in simple past tense and it is in active voice, we need to change it into passive voice.
Rule :
Subject + (was / were) + V3 + Optional Agents.