The correct answer is A. Love.
Sorrow is an emotion that is often associated with death. Death is the end of life, and it can be a very sad and difficult experience. Happiness, on the other hand, is an emotion that is often associated with love. Love is a positive emotion that can make people feel happy and fulfilled.
The other options do not have the same relationship as the original pair of words.
- Dance is an activity that can be done for fun or exercise. It is not typically associated with either sorrow or happiness.
- Cry is an action that is often done when people are sad or upset. It is not typically associated with happiness.
- Birth is the beginning of life, and it can be a very happy and joyful experience. However, it is not typically associated with sorrow.