ABCD can be arranged in any order on the number line, the question stem does not has enough information to rephrase. So, lets move to statements.
1. C is between A and B. There are four sequences possible here: ACDB, ADCB, BCDA, and BDCA. All cases has different distances (2 pairs) between B and D. INSUFFICIENT
2. A is to the left of D. Where is D w.r.t B? INSUFFICIENT
Together, we have ACDB or ADCB as the sequence, both with different distances between B and D. INSUFFICIENT.
I am the master of my fate. I am the captain of my soul.
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DS - If negative answer only, still sufficient. No need to find exact solution.
PS - Always look at the answers first
CR - Read the question stem first, hunt for conclusion
SC - Meaning first, Grammar second
RC - Mentally connect paragraphs as you proceed. Short = 2min, Long = 3-4 min