Final answer:
Option c: 'Elected officials don't feel a need for reaching out to those who probably don't vote' is the best revision of sentence 21 using a gerund phrase, as it maintains the original meaning and incorporates the gerund properly.
Step-by-step explanation:
The best way to revise sentence 21 using a gerund phrase is option c: Elected officials don't feel a need for reaching out to those who probably don't vote. This option effectively incorporates a gerund by using the phrase 'reaching out' which transforms the action into a noun-like concept, while maintaining the original meaning of the sentence.
Option c: 'Elected officials don't feel a need for reaching out to those who probably don't vote' is the best revision of sentence 21 using a gerund phrase, as it maintains the original meaning and incorporates the gerund properly.
The best way to revise sentence 21 using a gerund phrase is option b, which is 'Elected officials aren't feeling a need to reach out to those who probably don't vote.'