The two main criteria that the national science foundation (nsf) uses to evaluate grant proposals are: a. sustainability and innovation. b. intellectual merit and broader impact. c. ethical integrity and legal compliance. d. quality and quantity.

(B) Intellectual merits and broader impacts.

Explanation:

The NSF (National science foundation) is one of the government agency in the united state which is responsible for supporting various types of fundamental research and it is basically uses the two major criteria for evaluating the overall grant proposal that are:

 The intellectual merit is one of the criteria which encompasses all the knowledge and on the other hand the broader impacts as it encompasses all the benefits in the society and also achieve the specific desire.  

 Therefore, Option (B) is correct.

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