Final answer:
Option b, 'Growth in civic awareness might cause an increase in voter turnout,' is the best revision for sentence 17 as it effectively uses the active voice to directly relate the subject with the action. The correct option is b. Growth in civic awareness might cause an increase in voter turnout.
Step-by-step explanation:
The best way to revise sentence 17 using the active voice would be option b: Growth in civic awareness might cause an increase in voter turnout. This alternative actively assigns the action of causing an increase to the subject 'growth in civic awareness', which makes it an active voice construction.
Active voice typically makes sentences clearer and more direct by showing who or what is responsible for an action, leading to a stronger statement in discussions involving such issues as voter turnout and civic awareness.
Sentence 17 can be revised in the active voice as follows: Growth in civic awareness might cause an increase in voter turnout. Using the active voice makes the sentence clearer and more direct, focusing on the cause-effect relationship between civic awareness and voter turnout.
The correct option is b. Growth in civic awareness might cause an increase in voter turnout.