The defendant was grateful for the judge's clemency.

Answer: Option B

Patience : the capacity to accept or tolerate delay, problems, or suffering without becoming annoyed or anxious.
Mercy : compassion or forgiveness shown towards someone whom it is within one's power to punish or harm.
Relaxed : free from tension and anxiety.
Politeness : behaviour that is respectful and considerate of other people.
Clemency : mercy; lenience.

Synonym of Clemency is mercy