Which sentence is written correctly?

2. Earning a spot on the football team (which has won the championship the last two years) is quite an accomplishment.

Explanation:

Parentheses, commas, and dashes are punctuation marks used to enclose incidental or additional information within a sentence like a minor example, a brief explanation or a brief comment. From all choices, number 2 is the one that uses the parenthesis correctly because it uses parenthesis to enclose a brief explanation of the football team (additional information).

The other options, on the other hand, are incorrect because sentence 1  and 3 encloses information with parenthesis and commas respectively when it is not necessary as "to the mayor" and "and coffee shop" are not additional information, but phrases necessary to understand the full sentence. Option 3 is also incorrect because "a safe driver" is an explanatory statement of who Martin is and should be enclosed with commas, dashes or parenthesis.

answer: the sentence in the text that contains both the topic and the author's single most important idea about the topic

explanation: aww pineapple so adorable