Breaking Down the Info:

We need every integer to be 1 apart in this case as we already know they are lined up from small to large.

Statement 1 Alone:

We know b and c are consecutive, but also need to know if a and d are consecutive. Insufficient.

Statement 2 Alone:

We know b and c must be between a and d. Since the difference is 3, only two integers are allowed between a and d. Then we must have b and c be specifically a + 1 and a + 2. Note that these integers cannot repeat either since we already claimed a < b < c < d. Therefore statement 2 alone is sufficient.

Answer: B
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