Somebody stole my car last week.

Last week my car was steal by somebody.
My car was stolen last week by somebody.
My car was stolen that week by somebody.
Somebody last week has stolen my car.

The correct answer is: B. My car was stolen last week by somebody.

A. Last week my car was steal by somebody.
This sentence is grammatically incorrect. The verb “steal” should be conjugated in the past tense, “stole.”

C. My car was stolen that week by somebody.
This sentence is grammatically correct, but it is not as concise as the other options.

D. Somebody last week has stolen my car.
This sentence is grammatically correct, but it is not as natural-sounding as the other options.

The most concise and natural-sounding way to say this sentence is: “My car was stolen last week by somebody.”