An action in a sentence can be represented in two ways, namely active and passive voice.
The passive voice always uses the past participle form of the main verb irrespective of any tense. Only the auxiliary verbs depend upon the sentence given in the active voice.
The correct answer is B)A picture was being drawn by him.
Option B is correct as the subject of the given sentence (He) comes in the place of the object (a picture), the transformed sentence is also in the past continuous tense and uses 'was being' with the past participle of the main verb(draw).
Options A, C, and D are wrong as the given sentence is not in the simple past tense, 'been' is not used, and the past participle form of the main verb (draw) is not used respectively.