Answer:
C. Assonance
Step-by-step explanation:
Assonance is a stylistic literary technique that is found in a text when two or more neighboring words (which may or not be separated by a definite article or other short words) have the same vowel sound. In the line "wheeling freely through the open sky" Both bold words have the same vowel sound "ee".
Some others examples of this techniques are "That cat is bad", "Don't fear, dear" and "no man knows the truth"