Answer:
The option that is a key detail about Franklin's employment in the excerpt is:
D. Benjamin Franklin worked at the “New England Courant.”
Explanation:
Let's work with elimination to find the correct answer. <u>The question is about Franklin's employment, his job, which means we should ignore, so to speak, details that are not related to this topic.</u>
Letter A concerns Franklin's position in the family. He was the youngest of seventeen children. That has nothing to do with employment, so we can eliminate letter A.
Letter B concerns employment, but it is Franklin's father's job, not his. We can also eliminate it.
Letter C concerns Franklin's education, which was finished when he was only 10. We can also discard this option.
<u>Finally, we are left with letter D, the correct option. It speaks of Franklin's job at the publishing house for the "New England Courant".</u>