Answer:
The impact of the alliteration on the lines is:
A . It emphasizes accepting defeats the same as successes.
Step-by-step explanation:
An alliteration is the repetition of sounds or letters at the beginning of words that are close to each other in a structure. Now, where do we see alliteration in the lines?
"If you can meet with Triumph and Disaster / And treat those two impostors just the same;"
There is a repetition of t's in the second line, precisely when the speaker talks of treating both impostors the same way. Who are the impostors? Triumph and disaster. What the speaker means is that we must view and accept success (triumph) and defeat (disaster) the same way, instead of focusing on or rejecting one and not the other. Notice that the speaker is not claiming that they are the same thing. He talks of our ability to see them that way.