Step 1: Analyze tense.
The question implies present perfect (action has already happened).
Step 2: Correct form.
"Who has stolen my book?" is correct.
Step 3: Eliminate.
(A) steel – wrong word (metal).
(B) steal – base form, incomplete.
(D) stealing – continuous form, grammatically wrong.
Fill in the blank: The committee _____ divided on the issue.