Answer:
Present is the right answer.
Explanation:
It is not past or present participle because the verb is not in a form wich ends in <u>'</u><u>ing</u><u>'</u><u>.</u><u> </u> Past is also not correct because the verb is not in past tense, and she is talking about what's currently happening. Therefore Present should the right one.
To fail to function properly.
n.
A failure to function properly.
Only D.STONE because others are abstract
Answer:
1.) Challenging and difficult.