Answer:
The correct option is D) 1,600.
Step-by-step explanation:
Consider the provided information.
Half of the 2,400 first-year students at Red State University take calculus and half do not.
That means 1200 students take only English.
One-third of those who take Calculus also take English Composition, we can say
1200 take calculus and one third of it is: 
400 take Calculus also take English Composition.
Thus, the total number of students taking English Composition = 400 + 1200 = 1600
Hence, the correct option is D) 1,600.