Correct option is B
The correct meaning of the idiom
"Beauty is only skin deep" is
(b) A person's character is more important than his appearance.
Given Idiom: Beauty is only skin deep
Meaning: This idiom implies that physical beauty is superficial and temporary, while a person's character and inner qualities are of greater importance.
Example: He chose his friends based on their kindness, believing that
beauty is only skin deep.
Other Related Idioms:
1.
Don’t judge a book by its cover: Do not form opinions about someone or something based solely on their appearance.
2.
Example: She looks strict, but don’t judge a book by its cover—she’s very kind.
3.
Pretty is as pretty does: True beauty lies in good behavior and character rather than physical appearance.
4.
Example: Her actions proved the old saying, "Pretty is as pretty does."
5.
Appearances can be deceiving: Outward looks do not always reflect true nature.
6.
Example: He seemed friendly at first, but appearances can be deceiving.