A parallelogram is always which of these?

A. rhombus
B. quadrilateral
C. rectangle
D. square

B. Quadrilateral

Reasoning: a square must have 4 equal length sides with 4 right angles, and rectangle must have two sets of equal length sides with 4 right angles. A rhombus must have 4 equal length sides. A parallelogram does not fit into any of these 3 options all the time, so the only answer could be B