Answer:
C. In 1/2, two times numerator (2*1=2) is equal to denominator (2)
D. In 2/5, two times numerator (2*2=4) is smaller then denominator (2)
C. In 3/4, two times numerator (2*3=6) is greater than denominator (4)
I'm not sure I fully understand your answers to B and F though.