The correct answer is A.
A family is a group of individuals who live together and care of each other.
A main purpose of a family is to care and protect each other. Earlier on, the man was seen as the head of the family, providing food and material things for it to survive. The mother was at home taking care of the offspring.
In modern times, both parents seem to work and the household chores are shared. Nevertheless, a family is made on a free-will basis, meaning its members decided to be together for sentimental reasons mainly. This is why caring for each other is important, as it provides the family with a safe space for expressing their needs, meeting them and feeling loved and understood.
