50 POINTS PLS HELP ILL GIVE BRAINLEST Cyanobacteria are photosynthetic single-celled organisms that thrive on the sunlight and nutrients. Cyanobacteria blooms (blue-green algae) are a frequent occurrence in the Great Lakes, particularly in Lake Erie, Green Bay, and Saginaw Bay in August and early September. Which statement(s) describes the main cause(s) of the cyanobacteria blooms in the Great Lakes?

I. Increase in human population and activities such as industrialization and agriculture.
II. The nutrient levels of the Great Lakes are lower due to increased pollution.
III. Low oxygen levels in the Lakes attract cyanobacteria.

A. I only
B. II only
C. I and II
D. II and III