Which morpheme can typically be found at the beginning of a word?

The correct answer is: a prefix. A prefix is a type of morpheme that is added to the beginning of a word to modify its meaning. For example, in the word "unhappy," the prefix "un-" changes the meaning of "happy" to indicate its opposite.

In contrast, a suffix is added to the end of a word, while a root is the base form of the word that carries the core meaning. An affix is a general term that encompasses both prefixes and suffixes. Therefore, identifying the prefix as the correct answer highlights its unique position at the beginning of a word, distinguishing it from the other morpheme types.