Question

10. Choose the sentence that does not contain a parallelism error.

a.Most runners are successful at either running long distances or to sprint short
races.
b.Most runners are successful at either running long distances or sprint short races.
c.Most runners are successful at either running long distances or sprinting short
races.
d.Most runners are successful at either to run long distances or sprinting short races.

Answer 1

C.  Look at how each word is in the same tense and in complete sentences.