Step 1: Understanding the Question:
The passage has four blanks: two need an article ("a" or "an") before a noun, one needs a joining word between two adjectives, and one needs the correct preposition to complete a phrasal verb. We fill each blank based on the word right after it and the meaning of the sentence.
Step 2: Key Formula or Approach:
Use "a" before a word starting with a consonant sound and "an" before a word starting with a vowel sound. Join two similar adjectives ("bewildered" and "miserable") with "and." The phrasal verb "look up at" (meaning to look upward toward something) needs "at," not "to," "in," or "and."
Step 3: Detailed Explanation:
Blank 1: "around pit" - "pit" starts with a consonant sound, and this is the first general mention of the pit, so the correct article is "a."
Blank 2: "into which elephant has fallen" - "elephant" starts with a vowel sound, so the correct article is "an."
Blank 3: "bewildered miserable" - the sentence lists two describing words for the elephant's look, so the plain joining word "and" fits, giving "bewildered and miserable."
Blank 4: "made to look up a vast, curiosity-stricken crowd" - the fixed phrase is "look up at" someone or something, so "at" is correct here.
Putting all four together: "a; an; and; at," which is option (B).
Option (A) "an; a; at; and" swaps the articles for "pit" and "elephant" and misplaces "at" and "and." Option (C) "and; a; an; at" wrongly opens with "and" before "pit," which is not a noun that needs a joining word. Option (D) "at; a; an; and" starts with "at" before "pit," which is also not a preposition slot.
Step 4: Final Answer:
The correct sequence is "a; an; and; at," option (B).
\[ \boxed{\text{a; an; and; at}} \]