Some people argue that anyone who accepts a presidential pardon
a.) is admitting guilt for a crime
b.) is unduly influenced to vote for the president
c.) is violating the constitution
d.) is not allowed to testify at an impeachment trial

Some people argue that anyone who accepts a presidential pardon .

a.) is admitting guilt for a crime

Presidential pardons allows the president to forgive, or pardon, those who have committed offenses against the United States. (Article II, Section 2 of the United States Constitution)

well considering i can't see the graph, it's probably prices