Is a rectangle a parallelogram always, sometimes or never?

Always
For this question all you need to know are the properties of each shape.
The Properties of a Rectangle are
4 right angles
4 sides (Polygonal)
2 pairs of opposite congruent sides
congruent diagonals
2 sets parallel sides
Perpendicular bisecting diagonals
Both diagonals bisect angles
The Properties of a Parallelogram
4 sides
2 pairs opposite congruent sides
2 sets of parallel sides
both pairs opposite angles are congruent
diagonals bisect each other
Since the question is asking if a rectangle is a parallelogram you would check to make sure all the properties of the parallelogram agree with those of a rectangle and since they all do the answer is always.