Task: Question Answering
Input (English): Question: A certain manufacturer of cake, muffin, and bread mixes has 120 buyers, of whom 50 purchases cake mix, 40 purchase muffin mix, and 20 purchase both cake mix and muffin mix. If a buyer is to be selected at random from the 100 buyers, what is the probability that the buyer selected will be one who purchases neither cake mix nor muffin mix?

 Option A: a. 1/10

 Option B: b. 3/10

 Option C: c. 1/4

 Option D: d. 7/10

 Option E: e. 9/10
Output (English): Option C