Which sentence contains an error in punctuation?

a) (d)what was the object that nerved us, or those who went before us, to this choice?

b) (a)we have gathered here to affirm a faith, a faith in a common purpose, a common conviction, a common devotion.

c) (b)some of us have chosen america as the land of our adoption, the rest have come from those who did the same.

d) (c)for this reason we have some right to consider ourselves a picked group, a group of those who had the courage to break from the past and brave the dangers and the loneliness of a strange land.

I am not too sure but I think its either A or B

Explanation:

each year on this day, i make it a point to listen to dr. martin luther king jr.’s great “i have a dream” speech. it’s electrifying every single time.

the content of dr. king’s speech, his inspiring presence, and the moment in history all came together to make the iconic “i have a dream” speech the defining moment of the american civil rights movement. but there are several other reasons why this speech, delivered over 50 years ago, remains an example of one of the best speeches in american history.

since part of my job is to people become better presenters, i’ve noticed several techniques that we can all learn from and be inspired by in this magnificent speech.

it’s anchored in a powerful related location

in most cases, you can’t handpick the spot to give a presentation, as mlk did for supreme symbolic effect when he stood on the steps of the lincoln memorial and echoed the opening words of the gettysburg address (“five score years ago . . ). but you absolutely can amplify your message by adapting it to your setting and location.