Question

Read the passage.

Answer 1

Hello Jennifers4 

Answer: Best of all are the days we go horseback riding. (D)

Reason: This sentence is the best option out of your choices. It is a varied sentence pattern, so I would go with this choice if I was you.

Hope this helps!
-Chris

Answer 2

Horseback riding days are the best of all.

You can vary sentence patterns to make a sentence more appealing to the reader, also it gives the lecture a little bit of cadence that helps if you think your writting is getting boring.