Explanation

āύāĻŋāĻšā§‡āϰ āĻŦāĻžāĻ•ā§āϝāϟāĻŋ āϕ⧇āύ āϏāĻ āĻŋāĻ• āϤāĻžāϰ āĻŦāĻŋāĻ¸ā§āϤāĻžāϰāĻŋāϤ āĻŦā§āϝāĻžāĻ–ā§āϝāĻž:

āĻĒā§āϰāĻļā§āύ⧇āϰ āĻŽā§‚āϞ āĻŦāĻžāĻ•ā§āϝ:
“I know him better than you.”

āĻāϰ āĻ…āĻ°ā§āĻĨ: “āφāĻŽāĻŋ āϤāĻžāϕ⧇ āϤ⧋āĻŽāĻžāϰ āĻšā§‡ā§Ÿā§‡ āĻŦ⧇āĻļāĻŋ āĻ­āĻžāϞ⧋āĻ­āĻžāĻŦ⧇ (better) āϜāĻžāύāĻŋāĨ¤â€
āĻāχ āĻ…āĻ°ā§āĻĨ⧇āϰ āχāĻ‚āϰ⧇āϜāĻŋāϤ⧇ āϏāĻ°ā§āĻŦā§‹āĻšā§āϚ āĻ—ā§āϰāĻšāĻŖāϝ⧋āĻ—ā§āϝ āϰ⧂āĻĒ āĻšāĻŦ⧇:
“You do not know him as well as I.”

ā§§. Adjective āύāĻž, Adverb āĻŦā§āϝāĻŦāĻšāĻžāϰ
- Verb “know” āĻāϰ āϏāĻžāĻĨ⧇ adverb “well” (āĻ­āĻžāϞāĻ­āĻžāĻŦ⧇) āϞāĻžāϗ⧇āĨ¤
- “good” āĻāĻ•āϟāĻŋ adjective, āϝāĻž āϜāĻžāύāĻžāϰ āĻ•ā§āϰāĻŋ⧟āĻžāϰ āϏāĻ™ā§āϗ⧇ āĻŽāĻŋāϞāĻŦ⧇ āύāĻžāĨ¤
- āϤāĻžāχ “as good as I” āύ⧟, “as well as I” āĻšāϤ⧇ āĻšāĻŦ⧇āĨ¤

⧍. āϤ⧁āϞāύāĻž āĻ•āĻžāĻ āĻžāĻŽā§‹ (Comparison Structure)
- āϏāĻŽāϤāĻžāϰ āϤ⧁āϞāύāĻžā§Ÿ āφāĻŽāϰāĻž “as â€Ļ as” āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻ•āϰāĻŋāĨ¤
- āĻāĻ–āĻžāύ⧇ āĻŦāϞāĻž āĻšāĻšā§āϛ⧇ āϤ⧁āĻŽāĻŋ āϝāϤ āĻļāĻžāĻ°ā§āĻĨāĻ•āĻ­āĻžāĻŦ⧇ (well) āϜāĻžāύ⧋ āύāĻž, āφāĻŽāĻŋ āϤāϤ āĻļāĻžāĻ°ā§āĻĨāĻ•āĻ­āĻžāĻŦ⧇ (well) āϜāĻžāύāĻŋāĨ¤
- āĻĒ⧁āĻ°ā§āĻŖ āĻŦāĻžāĻ•ā§āϝ⧇ āϞ⧇āĻ–āϞ⧇: “You do not know him as well as I (know him).”
- āĻāĻ–āĻžāύ⧇ āĻļ⧇āώ⧇āϰ “(know him)” āĻ…āĻ‚āĻļ āϏāĻžāϧāĻžāϰāĻŖāϤ āĻŦāĻžāĻĻ āĻĻāĻŋā§Ÿā§‡ “I” āĻĻāĻŋā§Ÿā§‡āχ āĻŦāĻžāĻ•ā§āϝ āĻļ⧇āώ āĻ•āϰāĻž āĻšā§ŸāĨ¤

ā§Š. Pronoun: I vs. me
- “as well as I” āĻ “I” āĻšāϞ⧋ subject pronoun, āϝ⧇āĻšā§‡āϤ⧁ āĻāϰ āĻĒā§‚āĻ°ā§āĻŖāϰ⧂āĻĒ⧇ “I know him” āχāĻŽā§āĻĒā§āϞāĻžāχ āĻ•āϰāĻžāĨ¤
- “me” āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻ•āϰāϞ⧇ āϤāĻž object pronoun, āĻāĻŦāĻ‚ āĻŦāĻžāĻ•ā§āϝ āĻ—āĻ āύ ‘You do not know him as well as me.’ āĻšāĻŦ⧇, āϝāĻž āĻļ⧁āĻĻā§āϧ āύ⧟ (āĻāĻ–āĻžāύ⧇ āϏāĻŽā§āĻŽāϤāĻŋ-āĻ•āĻ°ā§āϤāĻž āĻ…āĻ‚āĻļ⧇ subject pronoun āĻĨāĻžāĻ•āĻž āωāϚāĻŋāϤ)āĨ¤

ā§Ē. Why not option C āĻŦāĻž D?
- C) “as well as me” – object pronoun, āϭ⧁āϞāĨ¤
- D) “as good as me” – adjective+object pronoun, āϭ⧁āϞāĨ¤

ā§Ģ. āĻ›āĻžāρāϟāĻžāχ āĻ•āϰāĻž āĻŦāĻžāĻ•ā§āϝ (Ellipsis)
- āĻĒā§‚āĻ°ā§āĻŖāϰ⧂āĻĒ: “You do not know him as well as I know him.”
- āĻ•ā§āϰāĻŽāĻŦāĻ°ā§āϧāĻŽāĻžāύ āϞ⧇āĻ–āϞ⧇ āĻŽā§‚āϞ āĻ…āĻ‚āĻļ (know him) āĻŦāĻžāĻĻ āĻĻāĻŋā§Ÿā§‡ ⤏⤂⤕āĨā¤ˇāĻŋāĻĒāĨā¤¤ āĻ•āϰ⧇ “as well as I” āĻŦāϞāĻž āĻšā§ŸāĨ¤

āϏāĻžāϰāϏāĻ‚āĻ•ā§āώ⧇āĻĒ:
āĻŦāĻžāĻ•ā§āϝāϟāĻŋāϤ⧇ “know” āĻ•ā§āϰāĻŋ⧟āĻžāϰ āϏāĻ™ā§āϗ⧇ adverb “well” āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻ•āϰāϤ⧇ āĻšāĻŦ⧇, āĻ“ āϤ⧁āϞāύāĻžāϰ āĻ•ā§āώ⧇āĻ¤ā§āϰ⧇ subject pronoun “I” āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻšā§Ÿ, āϤāĻžāχ āϏāĻ āĻŋāĻ• āωāĻ¤ā§āϤāϰ B) “You do not know him as well as I.”