The sentence whose subject is the subject of the whole paragraph is the
topic sentence
thesis sentence
controlling idea
sentence fragment

topic sentence

Explanation:

The topic sentence is a summary of the main idea of a paragraph. Therefore, it compiles what the paragraph will deal with; while the rest of the sentences provide evidence, explanation, exemplification to support the concept of the topic sentence.

The other options are incorrect because a thesis statement can consist of one or two sentences, a controlling idea leads to a point that must be confirmed or developed, and a sentence fragment is an incomplete sentence.

it translates into:

read the letter of your pen pal. write and answer 3 questions.

answer: i think it is saying that “the young man hopes she will be free. him escape signal him the door with the lady give him a ring run away with him.

explanation: i ask myself in my head and think and think until i found this