Either B or D. Most likely D. It definitely cannot be A since they are know for being messy and it can't be C because this is just not something the painting are iconic for.
Okay, so my answer gets deleted because I used the word I believe. Fine then. I hope you failed whatever quiz this was for
The answer was scale by the way.
Answer:
Maybe add a little bit more blending in the sunset and the water.
Explanation: