What is social support? (Multiple Choice)

What is social support?
 
  a. Social support is the group of people who meet to talk about current events,
  the weather, and sports
  b. Social support is the act of physically supporting someone who needs help
  getting up after falling and people who help clients take care of daily activities
  and errands
  c. Social support is the subjective experience of receiving care from friends and
  family
  d. Social support is the availability and subjective experience of receiving
  instrumental and emotional support from those in the client's social
  environment