The vector PQ is Q-P = (2, 1). The vector SR is R-S = (2, 2). One is not a multiple of the others, so the vectors are not parallel. In a parallelogram, these vectors would be identical. PQRS is not a parallelogram.
B, D, and E The absolute value of -37 is 37. The absolute value of 37 is also 37. When you distribute the negative in the parenthesis the -37 becomes positive.
