Below is a picture of a popcorn cup. Can you identify the quadrilateral formed by its lateral faces?

The correct option is B: Trapezium

Sides $AB$ and $CD$ are parallel,

$AD$ and $BC$ are not parallel sides of Quadrilateral $ABCD.$

Hence, we can say that quadrilateral $ABCD$ is a trapezium.

The geometrical shape that is formed by the lateral faces is a trapezium. Two sides are parallel and the remaining two sides may or may not be parallel.