Choose the correct option:
$(1)$ Depolarization of the ventricles induces the $QRS$ / $T$ waves.
$(2)$ Incomplete double circulation is seen in reptiles / birds.

• A
  $(1) QRS, (2) \text{Reptiles}$
• B
  $(1) T, (2) \text{Reptiles}$
• C
  $(1) QRS, (2) \text{Birds}$
• D
  $(1) T, (2) \text{Birds}$