Shaded and unshaded squares are arranged in rows so that:
- the first row consists of one unshaded square,
- each row begins with an unshaded square,
- the squares in each row alternate between unshaded and shaded, and
- each row after the first has two more squares than the previous row.
The first 4 rows are shown. The number of shaded squares in the 2020^{th} row is
Answer Choices
A. 2022
B. 2021
C. 2020
D. 2019
E. 2018