Question

complete the sentence. it was either through luck or ___________________ that katy was able to convince her claustrophobic parents to board the airplane. through sheer perseverance sheer perseverance

Explanation:

The sentence uses the structure "either through X or Y", where parallelism requires Y to match the structure after "through" (not repeat "through"). The first option repeats "through", breaking parallel structure, while the second option fits correctly.

Answer:

sheer perseverance