The correct option is
C are you trying
Answer : C
The Present
Continuous Tense is used to talk about an action or condition that is happening
now, frequently and may continue into the future.
Here
in the question, we see that the speaker is asking the other person what he / she is trying to do. As the speaker is making reference to the action happening right in the very moment of speaking, therefore
the correct tense to use here is Present Continuous Tense.
The sentences of Present Continuous Tense are formulated in the question form as :
to
be [am, is, are] + verb [present participle]
The "to be" verbs of various pronouns are:
- I -- "am"
- He / She / It -- "is"
- We/ You / They -- "are"
Here
the verb is "try", it's present participle is : "trying".
Thus,
the correct complete sentence is:
"What ARE YOU TRYING to do?