Let's simplify all the options.
1. 2g atoms of Nitrogen. This means that there are 2 moles of Nitrogen atoms. Which is 28 grams.
2. 3*1023 atoms of c. Which means 0.5 moles of C. Which is 6 grams.
3. 1 mole of S. Pretty easy, this is 32 grams.
4. 7 g of Ag is the mass already provided.
So we can observe that the answer is clearly 2. Because it is the least amount.