Which zone is the most productive? intertidal zone aphotic zone oceanic zone neritic zone

The neritic zone is the most productive zone among the choices given. The correct option among all the options that are given in the question is the fourth option or the last option. This is the zone where the water is shallow and sunlight reaches the ocean floor. I hope the answer comes to your help.

The answer is the magnetosphere.

Well, a and b together would be negative. b alone would also be negative.