15. which of the following sentences requires a colon to be correct? a. she gathered all of her ingredients to make a smoothie strawberries, blueberries, bananas, and yogurt. b. the new dessert recipe called for equal parts of sugar, cream, peanut butter, and crushed pecans. c. when she decided to write a letter, she grabbed her pen, paper, stamps, and address book. d. in his vacation suitcase, jonathan packed two pairs of pants, four shirts, his swimsuit, and his favorite pajamas.