Hello there! Out of the options given, the best answer is likely D. Effects.
This is because options A and B both have to do with motion. In B you create frame by frame videos, aka animations. B is what you use to trigger these animations and things like it. Lastly, for C, you use transitions to move between slides and text on powerpoint, to move between points and make it look more tailored to how you want it to look. That being said, D, effects, are literal effects, that will change the visual appearance of text and other items, making this your best choice.
I hope this helps and have a great day!