I think the numbers should be written as 3/4, 1 1/3, and 1 1/2.
To make two batches of yogurt, we multiply 3/4 by 2 which will give us an answer of
(3/4)(2) = 6/4 = 1 1/2
1 1/2 is greater than 1 1/3. The answer is the first choice, which can be properly written as,
(3/4) + (3/4) = 1 1/2 and 1 1/2 > 1 1/3