3.
The answer is: C
Explanation
The correct option is C: Atone.
"Atone" means to make amends for a wrong or to compensate for a mistake or misdeed. It involves taking actions to repair the harm caused and to seek forgiveness or reconciliation. The other options do not fit this definition:
"Exonerate" means to clear someone of blame or wrongdoing.
"Exacerbate" means to make a situation worse.
"Alienated" means to feel isolated or estranged.