Answer:
a) 1/6
Explanation:
Rebecca has a container that holds: 
6 white ribbons
 4 blue ribbons
 2 red ribbons.
The total number of ribbons is given as:
6 white ribbons + 4 blue ribbons + 2 red ribbons = 12 ribbons
 The probability of her picking a red ribbon without looking is calculated as:
Number of red ribbons/ Total number of ribbons
= 2 red ribbons/ 12 ribbons
= 1/6 
The probability of her picking a red ribbon without looking is 1/6
Option a is the correct Option.