Correct option is C
According to the World Health Organization (WHO), breastfeeding should be continued along with appropriate complementary foods for up to 2 years or beyond, for optimal growth and development of the child.
Explanation of options: (a) ✘ Incorrect. While exclusive breastfeeding is recommended for the first 6 months, continued breastfeeding with complementary foods is recommended up to 2 years or beyond. (b) ✘ Incorrect. 4 years is not recommended by WHO for breastfeeding. (c) ✔ Correct. WHO recommends continued breastfeeding with complementary foods up to 2 years or beyond. (d) ✘ Incorrect. Although breastfeeding is important in the first year, WHO emphasizes the continuation of breastfeeding until at least 2 years.