Clement, a Customer Service Representative at Sarah's Supermart, Has a Tough

Clement, a customer service representative at Sarah's Supermart, has a tough time handling customers during his first week at Sarah's Supermart.Charlie, Clement's colleague at the supermart, guides him through this tough period.To show his appreciation for Charlie, Clement writes him an email thanking him for his help.Charlie neither reacts nor replies to this mail.Charlie's behavior is an example of _____.

A) negativity effect
B) neutrality effect
C) positivity effect
D) generality effect
E) cordiality effect