Between which two integers does −2.5 lie on the number line?

Correct answer: −3 and −2

The governing concept is the order of integers on a number line. A number lies between two consecutive integers when it is greater than the left integer and less than the right integer. For −2.5, the correct comparison is −3 < −2.5 < −2. Thus −2.5 lies between −3 and −2, exactly halfway between them. Negative numbers require careful attention because the integer with the larger absolute value is farther left: −3 is left of −2. Option B describes the interval immediately to the right of −2, option C contains positive numbers, and option D is the interval to the left of −3. Therefore, option A is the only interval containing −2.5.