Is the example a complete sentence, sentence fragment, or run-on sentence?

The bird dove swiftly then it landed gently on the branch.

A.
sentence fragment

B.
complete sentence

C.
run-on sentence

Question

Is the example a complete sentence, sentence fragment, or run-on sentence? 

The bird dove swiftly then it landed gently on the branch.
 
 A.
sentence fragment
 
 B.
complete sentence
 
 C.
run-on sentence

seb.cal · Answer

C.

anonymous · Answer

its a complete sentence

seb.cal · Answer

@kennyboy00 No it's not. Don't give wrong answers.

anonymous · Answer

wait @seb.cal yo ugive wrong answer ?

seb.cal · Answer

No. I wouldn't do that. I'm trying to help you get an "A."

anonymous · Answer

if i fail i fail grades

anonymous · Answer

im still sticking to complete sentence

seb.cal · Answer

I can tell you why my answer is correct. A comma is supposed to come after the word, "swiftly"

anonymous · Answer

umm

anonymous · Answer

ah crap i barely noticed that you r correct listen 2 @seb.cal