Pick out the correct sentence:
APhysics is a branch of natural science.
BPhysics are a branch of natural science.
CPhysics have a branch of natural science.
DPhysics were a branch of natural science.
APhysics is a branch of natural science.
BPhysics are a branch of natural science.
CPhysics have a branch of natural science.
DPhysics were a branch of natural science.