keisha got up and started yelling at ronnie and and threatening him, but ronnie didn't even flinch because he knew that her bark was worse than her bite. what does "her bark was worse than her bite" mean?

A,B,C,D?

A - Ronnie thinks that Keisha will get in trouble for yelling.
B - Ronnie thinks that Keisha has bad breath.
C - Ronnie thinks that Keisha is loud but not dangerous.
D - Ronnie thinks that Keisha has a crush on him.​