A company reports the following information for its operating profit ratio:

2018 2019 2020

9.44% 9.99% 9.58%

Which of the following statements is true?

There may have been an increase in operating expenses in 2019

There has been an improvement in operating profit in 2019

There may have been a decrease in operating expenses in 2020

There has been an improvement in operating profit in 2020