Which of these statements is true according to research on social support?

a.) we should have at least three trusted friends with whom we can share our hopes, dreams, and disappointments.
b.) the increase of social media has resulted in stronger feelings of connectedness among its users.
c.) our mental and physical health is greatly affected by the quality of our relationships.
d.) despite previous beliefs, introverts have larger social networks than self-defined extroverts have.