Which sentence is the correctly written simple sentence? a. yellowstone is beautiful in spring and yosemite is beautiful in summer. b. spring and summer are beautiful times at yosemite. c. you can visit yosemite in summer, or you can go in spring. d. spring is a beautiful time at yosemite summer is too.

A - is a compound sentence because it has two sentences joined together
B - is a fragment because the sentences are joined but with no conjunction mark in front of the
C - is a run on sentence
D - is a simple sentence because even tho it has a compound subject it doesn't have a compound verb so therefore it is a simple sentence.

Hope this helps!