The table below shows the number of volunteers at a school between 2019 and 2023:
2019: 30, 2020: 45, 2021: 60, 2022: 55, 2023: 70
Which of the following statements is correct?
A)The number of volunteers increased every year.
B)The highest number of volunteers was in 2021.
C)There was a decrease in the number of volunteers between 2021 and 2022.
D)The number of volunteers in 2023 was lower than the number in 2020.