Using parallel structure means a-changing tense within verb structure. b-using one of five key structure words c-using the same tense and structure d-including driving directions in writing

Using parallel structure means C-using the same tense and structure.

This means that the same pattern of words should be used in order to show 2 or more ideas equally in terms of importance. It might help the reader understand better what is written. It most cases a colon is used to separate parallel structures. 

The answer might be a hope

Kthen, just here for points