A bag contains 20 marbles: 5 red, 5 blue, and 10 yellow. What is the probability that a red is randomly selected?
A) [tex]\frac{1}{4}[/tex]

B) [tex]\frac{1}{6}[/tex]

C) [tex]\frac{1}{12}[/tex]

D) [tex]\frac{1}{24}[/tex]