I’m pretty sure it is to read the text
The correct answer is the first option.
The sentence that presents the correct subject-verb agreement is the first one since in it we are talking about "heavy rains" OR "fast-melting snow". In other words, the subject is coordinated by the conjunction "OR" which makes the subject singular. The verb "causes" is conjugated in the third person singular.
An HIV can be transmitted to her baby during pregnancy, during delivery and during breast feeding. The answer is D.
