plz help me i will medal someone for the best response. Which sentence is the correctly written simple sentence?

A.
A tornado happens when a funnel cloud reaches the ground.

B.
A tornado is a violent storm; it forms from a rotating column of air.

C.
A tornado is a violent storm, and funnel clouds are rotating columns of air.

D.
A tornado is a violent storm, and it forms from a rotating column of air.

Question

plz help me i will medal someone for the best response.   Which sentence is the correctly written simple sentence?
 
 A.
A tornado happens when a funnel cloud reaches the ground.
 
 B.
A tornado is a violent storm; it forms from a rotating column of air.
 
 C.
A tornado is a violent storm, and funnel clouds are rotating columns of air.
 
 D.
A tornado is a violent storm, and it forms from a rotating column of air.

rainbow_rocks03 · Answer

i don't know if it is c or d?

anonymous · Answer

A, because it doesn't have a coma or semicolon. It is just one idea.

rainbow_rocks03 · Answer

but a simple sentence is when two nouns subjects are joined by the word and

rainbow_rocks03 · Answer

and @abbyanna101 A is a run-on sentence

anonymous · Answer

oh I'm dumb no it would be D because it forms one solid thought with the word and. C has two different thoughts, and should use a semi-colon.

rainbow_rocks03 · Answer

ty and you aren't dumb. everybody makes mistakes