一條mc 急用10分

the table shows the number of staff in three shops of a fast food china . a lucky draw of free tour of 7 days is made and one staff is selected at random from the three
shops .find the probability that the staff is a male staff from "central" shop.

shop ====aberdeen ==== central ==== wanchai
Male======18 ========= 25 ========23
Female=====22 =========15 =======17

a. 2/5
b. 3/20
c. 3/24
d. 5/24