Concept:
Certain vitamins such as Vitamins A, C, and E act as antioxidants and help protect body cells from damage caused by free radicals. These nutrients are often associated with cancer protection because they help reduce oxidative stress in the body.
Vitamin K mainly helps in blood clotting and bone metabolism and is not generally classified as a cancer-protective nutrient.
Step 1: Identify vitamins associated with cancer protection.
The vitamins commonly known for antioxidant and cancer-protective functions are:
\[
\text{Vitamin A, Vitamin C, and Vitamin E}
\]
Step 2: Find the vitamin not included in this group.
Vitamin K is primarily involved in blood coagulation and not mainly considered a cancer-protective nutrient.
Therefore, the correct answer is:
\[
\boxed{(C)\ \text{Vitamin K}}
\]