The Following Diagram Represents the First-Order Decomposition of a to Form

The following diagram represents the first-order decomposition of A to form X according to the following balanced chemical equation: A → X.Each sphere represents 1.0 mmol of atoms,and the volume of the box is 1.0 L. What is the rate constant?

A) 0.019 s^-1
B) 0.046 s^-1
C) 0.067 s^-1
D) 15 s^-1
E) 17 s^-1