Select the option that expresses the given sentence in passive voice.

Martin drew a picture of the snow-capped mountains.

A picture of the snow-capped mountains was drawn by Martin.

The correct passive form of the given sentence is A picture of the snow-capped mountains was drawn by Martin.

The active voice of the sentence is Martin drew a picture of the snow-capped mountains. This sentence is in the simple past tense, which is used to describe an action that happened in the past. The passive voice of the sentence is formed by putting the subject of the active sentence after the verb "to be" and the past participle of the main verb. In this case, the subject of the active sentence is "Martin" and the main verb is "draw." The past participle of "draw" is "drawn." So, the passive form of the sentence is A picture of the snow-capped mountains was drawn by Martin.

The other options are incorrect because:

• A picture of the snow-capped mountains is being drawn by Martin. is in the present progressive tense, which is used to describe an action that is happening now.
• A picture of the snow-capped mountains is drawn by Martin. is also in the simple present tense, but the verb "is" is not followed by the past participle of the main verb.
• A picture of the snow-capped mountains has been drawn by Martin. is in the present perfect tense, which is used to describe an action that has happened in the past but is still relevant to the present.