Question

Which is a run-on sentence?


A.
Keys are made for each lock, yet many keys look the same.


B.
Apples are generally red, but there are some golden varieties.


C.
Sailboats use wind power, but many sailboats also have a motor.


D.
Flamingos are usually pink one variety is bright red.

Answer 1

D. It's usually the one without a comma .