NEET 2020 Biology question

In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct ?

• (A)Gross primary productivity is always less than net primary productivity.
• (B)Gross primary productivity is always more than net primary productivity.Correct
• (C)Gross primary productivity and Net primary productivity are one and same.
• (D)There is no relationship between Gross primary productivity and Net primary productivity.