I think the answer that you are looking for is B but im not a 100% sure
Answer:
C: 
Explanation:
we can use the molarity equation

so to find M we plug in what we know, which is 6 moles of NaCl and 2 L of water, which gives us:

The mass number is the summation of number of proton and neutron present in a nucleus of an atom. For the neutral atom the number of positive charge (number of proton) must be equal to the number of electrons. The number of electrons present in an atom is the atomic number of the atom. The standard way to express the mass number (a) and atomic number (m) of a atom (say X) is
. Now for silicon number of electron or atomic number is 14. And the mass number (a) given 29. Thus the expression nucleus of silicon will be 
3. they make up larger compounds like fats and amino acids, would be the correct answer.