If a Public Health Official Was Trying to Reduce the Potential

If a public health official was trying to reduce the potential for human exposure to a "red tide" which of the following actions would they take?

A) Place a ban on eating fish that were exposed to the dinoflagellate Alexandrium catanella
B) Decrease the amount of nutrients that are washed into the aquatic ecosystem
C) Avoid eating shellfish that live in coastal areas that have a high influx of nutrients
D) All of the above would help reduce the potential for human exposure to a "red tide".