Answer:
C
Explanation:
Compound words are formed when two or more words are put together to form a new word with a new meaning. Since a, whitewash can be separated to white wash, it is a compound word. Since b, watchdog can be separated to watch dog, it is a compound word. Since d, buttercup can be separated to butter cup, it is a compound word. But C, if it was split up, cannot be any real word. C is the only non compound word in the answer choices.
I hope this makes sense and it helps you!
Brainliest!
