Find the Probability of the Following Card Hands-From a 52 $2.75 \times 10^{-4}$

Multiple Choice

Find the probability of the following card hands-from a 52 card deck. In poker, aces are either high or low. A bridgehand is made up of 13 cards.
-A royal flush (5 highest cards of a single suit) in poker

A) $2.75 \times 10^{-4}$
B) $1.54 \times 10^{-6}$
C) $3.85 \times 10^{-7}$
D) $1.98 \times 10^{-3}$