Almost all of the members are here.
Here, almost is:

• The correct answer is - খ) Adverb of Degree.

Adverb of degree:
এই ধরনের adverb কতোখানি, কি মাত্রায় এসব বোঝায়।
- It tells us about the intensity of something.
Example: Almost, quite, very, much, fully, partly, wholly, completely, strongly, totally, entirely, deeply, greatly, poorly, half, enough, somewhat, altogether, too, little, a little, rather.
- Example Sentence: Almost all of the members are here.

Adverb:
- Adverb হলো এমন একটি শব্দ যা verb (ক্রিয়া), adjective (বিশেষণ) অথবা অন্য adverb (ক্রিয়া বিশেষণ)-কে modify বা বিশেষিত করে।

Adverb of time:
- এই ধরনের Adverb যে গুলো ক্রিয়া সম্পন্ন হওয়ার সময় বুঝায়। এটি সাধারণত When কখন দিয়ে প্রশ্ন করলে উত্তর দেয়।
- Example: Now, then, before, since, ago, already, once, twice, thrice, again, soon, late, afterwards, yesterday, today, tomorrow, daily. early, formerly, frequently, presently, immediately, instantly.
- Example Sentence: TI have already finished my homework.

Adverb of manner:
- যে adverb কোনো কিছু কিভাবে হয় হচ্ছে তা উল্লেখ করে তাকে Adverb of manner বলে।
- Example: sadly, softly, steadily, slowly, soundly, swiftly, simply, suddenly, carefully, carelessly, easily, quickly, possibly, probably, luckily, fortunately, unfortunately, naturally, rightly, urgently, wrongly.
- Example Sentence: She walked slowly because she was tired.

Adverb of frequency:
- যে Adverb কোন কিছু করার বা কতো সময় পরপর হয় তা বোঝায় তাকে Adverb of frequency বলে।
- Some Adverb of frequency: always, usually, often, sometimes, rarely, never etc.
- Example Sentence: He usually goes to school by bus.

Source: Applied English Grammar and Composition by P. C. DAS.