Question

read the passage from president barack obamas back - to - school remarks.
and thats what i want to focus on today: the responsibility each of you has for your education. i want to start with the responsibility you have to yourself.
every single one of you has something youre good at. every single one of you has something to offer. and you have a responsibility to yourself to discover what that is. thats the opportunity an education can provide.
the repetition of responsibility in the passage helps obama achieve his purpose by
○ providing evidence to support his speech.
○ emphasizing the main idea of the speech.
○ showcasing his expertise at writing a speech.
○ soothing the audience with the rhythm of the speech.

Explanation:

The core of Obama's passage centers on the idea of personal responsibility for one's education. Repetition of a key term like "responsibility" serves to highlight and reinforce this central message, making it more memorable for the audience. The other options are incorrect: the repetition does not act as evidence, showcase writing expertise, or primarily soothe the audience with rhythm.

Answer:

B. emphasizing the main idea of the speech.