Choose the option that is the active form of the sentence.

By whom was this poem written?

Who wrote this poem?

The original sentence, "By whom was this poem written?" is in the passive voice. It places the focus on the doer of the action, asking who performed the action of writing the poem.

To convert the sentence to active voice, we make the subject of the sentence the doer of the action. In this case, the subject is "who," and the action is "wrote." Therefore, the active voice sentence is: "Who wrote this poem?"

The other options are incorrect:

1. "This poem is wrote by whom?" is still in passive voice. The verb form should be "is written" instead of "is wrote" to maintain the passive voice construction.

2. "Who write this poem?" uses the present tense "write," which does not match the past tense context of the original sentence.

3. "Who is wrote this poem?" combines the present tense "is" with the past tense "wrote," which creates an incorrect verb form.

Therefore, the correct option is: "Who wrote this poem?"