English giving brainliest if it's correct and explain

B. Principal Jenkins said, "I am confident that they [the baseball team] are the best team we've ever had.

Explanation:

The use of bracket is very much key in explaining or clarifying the original text. The editor or writer adds addition information in the bracket in order to explain a part of the sentence that was stated.

The bracketed information is usually an addition and not a subtraction.

From the selected answer, "the baseball team" that was bracketed is given an additional information or explaining that it is referring to the word "they".

Option B is the correct option that uses brackets correctly.

explanation: use this website and look at the examples to form your own poem : )