The Voltage Across and the Current Through a Single Circuit $\varOmega$

Multiple Choice

The voltage across and the current through a single circuit element connected to an ac generator are shown in the graph.
-Determine the reactance of this circuit element.

A) 20 $\varOmega$
B) 25 $\varOmega$
C) 40 $\varOmega$
D) 57 $\varOmega$
E) 80 $\varOmega$