Which is a correctly written sentence, not a run-on?

A.
A bird laid eggs in a nest on the patio they should be hatching soon.

B.
Jacaranda trees have fernlike leaves, they bloom purple flowers in spring.

C.
Tomatoes in our garden are ripening; they will be delicious in a salad.

D.
Dog-sitting is fun and challenging it takes patience and organization.

Question

Which is a correctly written sentence, not a run-on?	
 
 A.
A bird laid eggs in a nest on the patio they should be hatching soon.
 
 B.
Jacaranda trees have fernlike leaves, they bloom purple flowers in spring.
 
 C.
Tomatoes in our garden are ripening; they will be delicious in a salad.
 
 D.
Dog-sitting is fun and challenging it takes patience and organization.

anonymous · Answer

C. All other sentences lack a conjunction - but C connects these two parts of the sentence with a semicolon.