The correct answer is B. High school graduates should be required to take a year off to pursue community service projects before entering college in order to increase their maturity and global awareness.
Step-by-step explanation:
A thesis statement is a claim or statement that guides a persuasive text or speech. For a thesis statement to be effective it needs to state the position of the author towards some situation, topic or issue rather than expressing an opinion, fact or asking a question; provide some details that explain this position and be debatable which means the author will need to provide evidence for the audience to believe the position stated the thesis.
Considering this, the most effective thesis statement for a persuasive speech is B. considering this thesis statement clearly states the position of the author towards the requirements for high school graduates that want to enter college; also, the author is not only stating his position by providing reasons or details to explain it " increase their maturity and global awareness" and this is debatable as it is necessary to have evidence to explain it and prove it which means this thesis statement would be effective for a persuasive speech.