Try ________ as many languages as possible.

Correct option is A

The correct answer is (a) to learn.
Explanation:
· "Try to learn" is correct because "try + to + V1" means making an effort to do something.
· Correct sentence: Try to learn as many languages as possible.
Grammatical Rule Used (English):
· "Try to + V1" is used when putting in effort.
· Structure: Try + to + base verb (V1).
व्याकरणिक नियम (Hindi):
· "Try to + V1" का उपयोग किसी कार्य को करने के प्रयास को दिखाने के लिए किया जाता है।
· संरचना: Try + to + क्रिया का मूल रूप।
Meanings of other given options:
· Learn: Incorrect because it lacks "to".
· Learnt: Incorrect because it is the past form.
· Learning: Incorrect because "Try learning" means experimenting, not making an effort.