Judge the following sentence according to the criteria given below: Nutrient availability is a more ...

Judge the following sentence according to the criteria given below: Nutrient availability is a more important factor than solar radiation affecting the distribution of life in the oceans BECAUSE photosynthesis is the foundation of most of the oceanic
 
  food web. A) The assertion and the reason are both correct, and the reason is valid.
  B) The assertion and the reason are both correct, but the reason is invalid.
  C) The assertion is correct, but the reason is incorrect.
  D) The assertion is incorrect, but the reason is correct.
  E) Both the assertion and the reason are incorrect.