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.

The two main criteria the National Science Foundation (NSF) uses to evaluate grant proposals are Option B, intellectual merit and broader impact.

Explanation:

The National Science Foundation funds many different kinds of research, ranging from the social sciences to the pure sciences like chemistry and physics. They identify two priority considerations when deciding on whether to award a grant. The first is the intellectual merit of the project. NSF funded research should advance current knowledge. The project will also need to articulate its relevance by showing it has broader impacts. There needs to be a potential benefit and contribution to society at large.