Read the paragraph from the section "Shellfish."

Lower pH values occur naturally on the West Coast during upwelling events, but recent observations indicate that CO2 originating from human activities is contributing to seasonal aragonite undersaturation. Scientists suspect that low pH may be a factor in the oysters' reproductive failure. More research is needed to disentangle potential acidification effects from other risk factors. Nonetheless, acidification is a potential factor in the current crisis to the multi-million-dollar oyster industry. The potential role of ocean acidification is encouraging new collaborations and accelerated research on ocean acidification and its biological impacts.

Which of the following can be inferred from the selection above?

A
Human activities are the primary cause of the aragonite undersaturation during upwelling events.
B
While some marine organisms are harmed by ocean acidification, others are helped by the lower pH levels in the ocean.
C
Collaborators are more motivated to study ocean acidification because of the economical impact it has on the oyster industry.
D
Ocean acidification is not to blame for the oysters' reproductive failure because lower pH values are natural during upwelling events.