What is the correct pairing of blood vessels and the speed of blood flow?

What is the correct pairing of blood vessels and the speed of blood flow?
 
  a. Arteries - slowest
 b. Capillaries - fastest
 c. Arteries - medium
 d. Arterioles - fastest
 e. Capillaries - slowest

Question 2

The development of vaccinations began when Edward Jenner noticed that ________.
 
  a. people who had earlier exposure to cowpox did not develop smallpox
 b. people who drank water from a particular public water pump developed cholera
 c. bacteria removed from a sick animal would cause the same illness if injected into a healthy animal
 d. rats were always present when people contracted bubonic plague