Which of these problems can be best showed through community action ?

All of them, because Conner can talk to somebody about is issue, Rebecca's community could do fundraisers to help get her and them better medical services. And Thierrie's community couldmove the bike out of the way or Thierrie could move it him self and/or the community could get together 

Ithink is public relations

Bmust be the answer, as technically all organs move, so a is incorrect. all organs are made of different types of cells, so that isn’t a problem, so c is also incorrect. human hearts are very similar to many other animals’ hearts, so d is also incorrect, yet the heart is made of muscle, which is hard to grow in the lab so it would be correct to say b