This question checks a specific fact about the way the Census of India 2011 was publicised. A census this large needs a simple, friendly face to make ordinary people trust the survey takers who come to their door, and the option that describes that face is the correct one.
Because the actual field staff going house to house to collect data were enumerators, many of them women, the census authorities chose a woman enumerator as the human, approachable symbol of the exercise.
Let's summarize:
The correct answer is a woman enumerator.