The "is" should be an "are" since there are multiple vehicles doing the tour.
The speaker is the one who has the apple orchard on his property.
The answer is D. very much at it good.
Hey mate!
You stuck?
Using pronouns such as he, she, it, or they, will increase the productivity of a third person POV. When writing in 3rd person, you must refrain from using pronouns such as, I and me, from the 1st person POV and from the second person, which uses pronouns such as you and yours.
Hope this helps! :)