The correct answer is: D. to try
The sentence is in the present progressive tense, which means that the action is happening now. The verb “try” is an infinitive, which means that it is not conjugated for any person or tense. In this case, the infinitive “to try” is used to express intention or purpose. The speaker is saying that they are about to try out their new mobile phone.
The other options are incorrect because they are not in the infinitive form. The verb “trying” is the present participle of the verb “try”, and the verbs “tried” and “try” are the past tense and simple present tense forms of the verb, respectively.
Here are some examples of how the infinitive form of the verb “try” can be used:
- I am going to try to get a good night’s sleep tonight.
- I tried to call you, but your phone was off.
- Please try to be on time for the meeting.
- I would like to try that new restaurant.