A Bag Contains 3 Red Marbles, 2 Green Ones, 1 $\frac { 5 } { 28 }$

A bag contains 3 red marbles, 2 green ones, 1 fluorescent pink one, 2 yellow ones, and 2 orange ones. Suzy grabs 4 at random. Find the probability of the event: "She gets all the red ones, given that she gets the yellow one."

A) $\frac { 5 } { 28 }$
B) $\frac { 1 } { 21 }$
C) $\frac { 5 } { 21 }$
D) $\frac { 1 } { 84 }$
E) $\frac { 5 } { 84 }$