Chapter 4 - Section 4.3 - Limiting Reactant, Theoretical Yield, and Percent Yield - Conceptual Connection - Page 147: 4.3

The correct answer is (c)

As we can see from the initial flask, nitrogen is the limiting reagent, and hydrogen is in excess. There are 2 molecules of nitrogen, enough to form 4 molecules of ammonia. 6 molecules of hydrogen are used up in the reaction, and the final mixture has 4 molecules of ammonia and 2 molecules of hydrogen. So, the correct answer is (c).