Final answer:
The ratio of cashews to the total mix is 1:6, which is calculated by adding 1 part cashew to 2 parts nuts and 3 parts cheese, resulting in a total of 6 parts.
Step-by-step explanation:
To determine the ratio of cashews to the total mix, we add up the parts for cashew, nuts, and cheese together. The mix contains 1 part cashew, 2 parts nuts, and 3 parts cheese. This gives us a total of 1 + 2 + 3 = 6 parts.
Therefore, the ratio of cashews to the total mix is 1 part cashew to 6 parts total mix. So the answer is option a) 1:6.