Which one of the following sentences is CORRECT?
A Sarah and Rachel is working at the loom.
B Sarah and Rachel are doing working at the loom.
C Sarah and Rachel was working at the loom.
D Sarah and Rachel were working at the loom.
A Sarah and Rachel is working at the loom.
B Sarah and Rachel are doing working at the loom.
C Sarah and Rachel was working at the loom.
D Sarah and Rachel were working at the loom.