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• The correct answer is – She's a very fast runner.

- এখানে runner হলো noun.
- fast এই noun কে describe করছে।
- সুতরাং এখানে fast - adjective.

• Adjective:
- সাধারণত noun বা pronoun এর পূর্বে বসে noun বা pronoun কে modify করে।

• Fast: [adjective]
- English Meaning: moving or happening quickly, or able to move or happen quickly.
- Bangla Meaning: ক্ষিপ্র; দ্রতগামী।

• Other options:
ক) You'll have to act fast.
- fast এখানে 'act' verb -কে modify করছে তাই এই বাক্যে, fast হলো adverb.

গ) Don't drive so fast!
- fast এখানে 'drive' verb -কে modify করছে তাই এই বাক্যে, fast হলো adverb.

• Fast: [adverb]
- English Meaning: quickly.
- Bangla Meaning: দ্রুত; তাড়াতাড়ি।

ঘ) One day a week he fasts for health reasons.
- fast হলো verb, অর্থাৎ "রোজা রাখা/উপবাস থাকা" অর্থে verb হিসেবে ব্যবহৃত হয়।

• Fast: [verb]
- English Meaning: to eat little or no food for a period of time, especially for religious or medical reasons.
- Banla Meaning: উপবাস করা; রোজা রাখা।

Source:
1. Accessible Dictionary by Bangla Academy.
2. Cambridge Dictionary.
3. Merriam-Webster Dictionary.