Judge the following sentence according to the criteria given below: Productivity in middle latitude oceans is very low during winter BECAUSE nutrient concentrations are highest at this time
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.
B
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____________________. Fill in the blank(s) with the appropriate word(s).