The answer which is true about phrases is that C. they can't stand alone because they are missing a subject, a verb, or both.
This is an example of a phrase:
having considered the problem carefully
Answer: um the hare ($-$)
Explanation:
Answer: D. They have opposite charges.
Explanation: When two items are attracted to each other, they must have opposite charges. when they both have positive charges or both have negative charges then they reflect each other.