Question 1: Part A
The central idea of the poem is:
2. The present location of the speaker is much less desirable than the seaside.
Question 2: Part B
The first line of the poem helps develop the correct central idea from Part A because:
2. The line suggests that sometimes the true feelings of the speaker are hidden.
This line implies that the speaker's love for nature and the seaside contrasts with their current feelings about their present location.