The line wheeling freely through the open sky contains an example of
a. alliteration
b. simile
c. assonance
d. oxymoron

C. Assonance

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"

C. Assonan ce

Explanation:

Assonan ce is the rep etition of a vo wel sou nd or diphth ong in non rhy ming stress ed syll ables.

The rest of the choices are wrong because alliteration is the occurrence of the same letter or sound at the beginning of contiguous words; simile is a straightforward comparison between different things; and oxymoron happens when opposite terms appear in combination.