A. 3 sodium, 1 phosphorus, 4 oxygen

B. 4 sodium, 4 phosphorus, 4 oxygen

C. 12 sodium, 1 phosphorus, 4 oxygen

D. 12 sodium, 4 phosphorus, 16 oxygen

- In one unit of [tex]\( \text{Na}_3\text{PO}_4 \)[/tex]:

- There are 3 sodium (Na) atoms.

- There is 1 phosphorus (P) atom.

- There are 4 oxygen (O) atoms.

Now, since we are dealing with 4 units of [tex]\( \text{Na}_3\text{PO}_4 \)[/tex], we will multiply the number of each type of atom by 4.

1.

- There are 3 sodium atoms in one unit.

- For 4 units, the total number of sodium atoms is [tex]\( 3 \times 4 = 12 \)[/tex].

2.

- There is 1 phosphorus atom in one unit.

- For 4 units, the total number of phosphorus atoms is [tex]\( 1 \times 4 = 4 \)[/tex].

3.

- There are 4 oxygen atoms in one unit.

- For 4 units, the total number of oxygen atoms is [tex]\( 4 \times 4 = 16 \)[/tex].

So, in [tex]\( 4 \text{Na}_3\text{PO}_4 \)[/tex], there are:

- 12 sodium atoms,

- 4 phosphorus atoms,

- 16 oxygen atoms.

Therefore, the correct answer is:

[tex]\( \text{12 sodium, 4 phosphorus, 16 oxygen} \)[/tex].