The answer is b. (The chattering chipmunks are hiding several acorns in that tree.)
Many words are formed by adding prefixes or suffixes to the beginning or end of the root of the word. The root of a word is usually not a stand-alone word. For example, the word "reject" is formed using the prefix "re" and the Latin root "ject" which is not the stand-alone word. It's similar to adding suffixes. There are indeed many Greek and Latin prefixes, roots and suffixes that are in everyday use and we are not even aware. For example, the Latin roots are: forms, multi, ambi, scribes, cent etc. Some of the Greek roots are: hetero, bio, gram, graph, pseudo etc. Then the prefixes: anti, de, over, semi, sub, trans, etc. Suffixes: able, ful, ing, ness, less, ed, etc. It is estimated that there are thousands of such prefixes, roots and suffixes.
