A. Because dropped and surrendered can often lead to sadness, and the other answers don’t convey sadness in the way answer a does, for example b. Snowflakes twirled, winters parade, confetti, c. Sun coming out and giving light is the opposite of sadness,
It is true that the synthesis of a large collection of information that encompasses well-tested hypotheses about certain aspects of the natural world is known as a scientific theory.
