Answer:
C. The repetition of vowel sounds in a series of words.
Step-by-step explanation:
When you're given questions such as this one, the tools that could help you are a dictionary and glossary. A dictionary is an alphabetically arranged listing of words that contains different information about them, such as their definitions, examples, origin, pronunciation, etc. A glossary is an alphabetically arranged listing of words from the same field with their definitions. For example, you could find the definition of assonance in the glossary of literary terms.
Assonance is a literary device in which vowel sounds are repeated in a series of words. An example of a sentence that contains assonance is: Go slow over the road. We can see that the vowel O is repeated.