What are $P, Q,$ and $R$ in the given diagram?
$P \quad\quad Q \quad \quad R$

• A
  Fascicle $\quad$ Muscle fiber $\quad$ Blood capillary
• B
  Muscle fiber $\quad$ Fascicle $\quad$ Blood capillary
• C
  Fascicle $\quad$ Blood capillary $\quad$ Muscle fiber
• D
  Muscle fiber $\quad$ Blood capillary $\quad$ Fascicle