Answer:
First, second, and fourth sentence have colon errors.
Explanation:
Colon (:) is a punctuation mark which is often used to place a list of items, to separate independent clause, used while applying quotations, and for expanding the sentence. The correct use of colon in the given sentences are as follows:
• How to Reduce Exam Stress: During exam season, both your anxiety levels and academic performance are influenced by: what you consume.
• Jimmy Cole, a professional dietitian, says: “Your focus should be on high nutrient foods that will provide you with a continuous source of energy over the whole day."
• "In addition," says Cole, "berries of all colors are awesome: You can juice them, make smoothies or jam from them, or just sling them into a salad or a bowl of porridge. Whatever works!”
