The nutritionist told him to avoid eating lots of carbohydrates, focus having more protein-rich foods

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

The nutritionist told him to avoid eating (A) lots of carbohydrates, focus having (B) more protein-rich foods (C) and green vegetables, and drink (D) at least eight glasses of water a day.