Question

Which LEAST describes a topic sentence?

A topic sentence is a specific detail about the subject of a paragraph.
A topic sentence can express an opinion.
A topic sentence states the central idea of a paragraph.
A topic sentence suggests ideas for the development of the rest of the paragraph.

Answer 1

The second one, the topic sentence should never express an opinion unless otherwise instructed.

Answer 2

A topic sentence can express an opinion.

Step-by-step explanation:

A topic sentence is the most relevant sentence of a paragraph. It does not express an opinion, instead, a topic sentence sets the main hypothesis, the tone, and the general idea of a paragraph. In this sense, it cannot merely express an opinion, in any case, it would introduce a general idea, to connect with the evidence, reasons, and arguments to validate the statement, which are going to be further developed in the rest of the paragraph. For these reasons, the other three options describe better what a topic sentence is, but the second one is the one that describes it the least.