Explain answer choice - Verbal

Her should not be confused with miserliness; as long as I haveknown her, she has always been willing to assist those who are in need.
A stinginess
B diffidence
C frugality
D illiberality
E intolerance
F thrift

I chose A & F but according to OG the answer choice is C & F. Can someone pls explain why my answe is incorrect.

Can you check A C and F on vocabulary.com? You’ll understand where you went wrong. This is purely a vocab issue.