Final answer:
The recommended serving size for 100% juice in the Fruits and Vegetables category according to the Canadian Food Guide is 120 mL (0.5 cup).
Step-by-step explanation:
The Canadian Food Guide recommends different serving sizes for various food groups. When it comes to the Fruits and Vegetables category, particularly for 100% fruit juice, the recommended serving size is 120 mL (0.5 cup). This is based on the guideline that suggests using juice as a replacement for half of your fruit intake, as long as it is 100% fruit juice. The list you've provided also includes this measurement, suggesting that half a cup of juice is equivalent to one serving of fruit.