From a deck of 52 cards, two cards are radomly drawn without replacement. Which expression represents the probability of drawing two hearts?
A2/52
B13/52· 13/51
C13/52· 12/51
D13/52· 13/52
A2/52
B13/52· 13/51
C13/52· 12/51
D13/52· 13/52