Match the tissues to their functions

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

i believe it would be c: tons.

a lot of people sadly don't know the best way to learn is cheating off of your friends or this amazing thing called google

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully