The basket costs $16.50, and the p pounds of apples cost $0.95p. We want to know which of those figures is larger.

Statement 1 is irrelevant, since we don't care how many apples are in the basket -- we already know the basket costs $16.50. What we need is information about the p pounds of apples.

Statement 2 tells us what Maria spends if she buys 4 more pounds of apples than she actually bought. Buying 4 pounds of apples will cost (4)(0.95) = 4 - 0.20 = 3.80, so if she bought p+4 pounds of apples, she'd spend exactly $3.80 more than she'll spend buying p pounds of apples. If p+4 pounds will cost her $18.05, then p pounds will cost her $14.25 (18.05 - 3.80). So the basket is more expensive, and Statement 2 is sufficient, and the answer is B.

Of course, the actual calculation of the cost of the p pounds of apples here is unnecessary in DS, as long as you can see that the calculation will lead to a number.