Not sure if you want details or not but I'll explain for each answer.
(A) No, if its doubled that means its 50%
(B) No, its 150% from before
(C) Yes, reduced is decreased and a quarter is 1/4 which is equal to .25
(D) No, the price decreased by 50%
(E) No, 1.5 is equal to 150%
(F) No, 2/3 is 66%
(G) No the price decreased by 200%
(H) Yes, its 75% of the price before so it decreased by 25%
So to sum it up the answers are C and H. Just in case wait for someone elses answers, but i hope this helps :)