Question

1. the drop in infant mortality worldwide is mostly due to a. vaccines. b. safe water supplies. c. air quality. d. a and b e. a, b, and c

Explanation:

Vaccines (A) prevent infectious diseases, safe water (B) reduces water - borne illnesses, and improved air quality (C) lessens respiratory issues. All these factors contribute to lower infant mortality. So the correct option includes A, B, and C.

Answer:

E. A, B, and C