Why do seeds keep in an air-tight container and not sprout? 

Air-tight containers prevent the entry of air and moisture inside the containers. They are used to seal the food to prevent it from getting degraded. For sprouting air and water are essential things. As there is no availability of air water inside the air-tight containers so no sprouting takes place. 

Air-tight containers prevent the entry of air so there is less air. 

There the correct answer is an option (D).