Change into passive my sister had visited many places​

Many places have been visited by my sister.

Explanation:

An active sentence is a sentence where the subject is performing the action.

For example, "My friend chases birds."

In this sentence the subject (friend) is doing the action of chasing.

A passive sentence is a sentence usually contains the word "by" and occurs when the subject is having something done to it.

B

Explanation:

It is the only one that dosen't talk about more than one subject