Please choose the correct answer to the question: In clear weather, a bright light can be seen for a long distance. In conditions of heavy fog, the visibility is greatly reduced. Which of the following explains the reduced visibility?

Answer1: Light is refracted by water vapor in the air. Answer2: Light is scattered by water droplets in the air. Answer3: Light is absorbed by water vapor near the ground. Answer4: Light is reflected by water droplets on the ground.

Answer format: answer1/answer2/answer3/answer4