3. Red tides are dangerous because of ________. (A) the dinoflagellates that cause them produce a strong neurotoxin (B) the euglenoids that cause them produce a toxin that causes severe flulike symptoms (C) the green algae that cause them produce a severe allergic reaction in most people (D) the diatoms that cause them produce severe gastric distress (E) the red algae that cause them can disrupt shipping by clogging propellers