Final answer:
The ratio that compares the part to the whole in this situation is the ratio of the number of marbles of a specific color to the total number of marbles. The total number of marbles in Sunny's collection is 6.
Step-by-step explanation:
The ratio that compares the part to the whole in this situation is the ratio of the number of marbles of a specific color to the total number of marbles.
The total number of marbles in Sunny's collection is 2 + 3 + 1 = 6.
Therefore, the ratio of pink marbles to the total is 2/6, the ratio of white marbles to the total is 3/6, and the ratio of the gold marble to the total is 1/6.