How Many Carbon Atoms Does It Take to Produce a Layer

Multiple Choice

How many carbon atoms does it take to produce a layer one atom deep that is the size of the period at the end of the next sentence? Assume the area covered by the period is 0.2 mm² and that one carbon atom has a diameter of 160 pm and covers an area of 0.02 nm².

A) 1.0* 10¹²
B) 1.0 * 10¹¹
C) 1.0 *10⁷
D) 1.0 * 10¹³
E) 2.0 * 10⁶