In the following question, out of the four alternatives, select the alternative which best expresses the meaning of the idiom/phrase.
an arm and a leg

A

a large, possibly exorbitant, amount of money

B

a highly motivated person can succeed even with few resources

C

one loves a person so much that one is willing to sacrifice his most precious things for them

D

all children are equal for a mother. She can't sacrifice anyone.