A. 1/6 of the pizza.
If Marco and two of his friends are going to share 1 pizza, they will be splitting the pizza into 3 equal parts since there are 3 people. Therefore, each person will get 1/3 of the pizza.
To find out how much each person gets out of the 1/3, we need to divide 1/3 by 3 (the total number of people).
1/3 ÷ 3 = 1/9
Therefore, each person will get 1/9 of the pizza.
To simplify 1/9 as a common fraction, we can express it as 1/3 multiplied by 1/3.
1/3 * 1/3 = 1/9
Therefore, each person will get 1/6 of the pizza, which is equivalent to 1/3 divided by 3.