Refer to the Figure

Refer to the figure.
Which of the following statements is true?

A) With the absence of Corophium volutator in May, the percent of silt content was higher than the amount of erosion.
B) With the absence of Corophium volutator in August, the percent of silt content was equal to the amount of erosion.
C) With the absence of Corophium volutator, the percent of silt content and the amount of erosion was unaffected.
D) With the absence of Corophium volutator, the percent of silt content remained the same while the amount of erosion continuously decreased.