The sentence below contains an error. What should be done to improve the sentence?

Elijah and Gwyn like to build kitchen inventions, constructing simple machines from old bicycle parts, and also programming computer games.

A.
The sentence is in passive voice and should be rewritten in active voice.
B.
The sentence should be rewritten using parallel structure.
C.
The sentence is a fragment and should be rewritten to be complete.
D.
The sentence contains a dangling modifier that should be removed or the sentence rewritten.
it's not a