Which 'better' is an adverb?

• 'Better' শব্দটি বিভিন্ন Parts of Speech হিসেবে ব্যবহৃত হতে পারে।

Better (adjective):
- Comparative of good: of a higher standard, or more suitable, pleasing, or effective than other things or people.

Better (adverb):
- In a more suitable, pleasing, or satisfactory way, or to a greater degree.

Better (noun):
- Something that is of a higher standard than something else.

Better (verb):
- To improve a situation.

Given options,
ক) The next time he took the test, he was better prepared.
- এখানে 'better' শব্দটি prepared (adjective) কে modify করছে।
- তাই, এটি একটি adverb.

খ) He stood near the front to get a better view.
- এখানে 'better' শব্দটি view (noun) কে modify করছে।
- তাই, এটি একটি adjective.

গ) You shouldn't be so mean to your mother - she deserves better.
- এখানে 'better' শব্দটি higher standard অর্থে noun হিসেবে ব্যবহৃত হয়েছে।

ঘ) The organization was established to better conditions for the disabled.
- এখানে 'better' শব্দটি verb.
- condition improve করা অর্থে ব্যবহৃত হয়েছে।

Source:
1. Cambridge Dictionary.
2. Accessible Dictionary by Bangla Academy.