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

The old woman was helped by the boy while crossing the road.

The boy helped the old woman while crossing the road.

The correct option that expresses the given sentence in active voice is The boy helped the old woman while crossing the road.

The other options are incorrect because:

• The boy has helped the old woman while crossing the road. is in the present perfect tense, while the original sentence is in the simple past tense.
• The boy is helping the old woman while crossing the road. is in the present progressive tense, while the original sentence is in the simple past tense.
• The boy was helped the old woman while crossing the road. is grammatically incorrect. The verb "to help" is transitive, which means that it takes a direct object. However, the subject of the sentence is "the boy," which is not a direct object.