This amount of electric energy is enough for the distance that the drone is expected to use to reach the point.
(I already know well there's more natural-sounding sentences, but I constructed this sentence like this on purpose to study what I want to know, so you don't need to suggest edited versions of the sentence.)
("that-relative clause" is "that the drone ... the point")
1. Is this sentence grammatically correct? My answer is yes.
2. What is the direct object of "use" in the sentence? I think the direct object is "this amount of electric energy" because it is the drone that is going to use the electric energy.
3. Given A and B, which sentence sounds more natural? I think A and B all sound natural, but A seems to be better.
A : This amount of electric energy is enough for the distance that the drone is expected to use to reach the point.
B : This amount of electric energy that the drone is expected to use to reach the point is enough for the distance.
4. Like A, if "that-relative clause" is long, in B, can I place "that the drone...to reach the point" part behind "the distance" in order to emphasize the part of "This amount of....the distance", breaking the rule that "relative pronoun" must be placed right behind its antecedent?
5. Are these sentences below grammatically correct as well? I think C, D are all correct English, except F.
C : The new game is going to be released in stores next month that is expected to be the most popular military game of the year.
D : The new game is going to be released in stores next month, which is expected to be the most popular military game of the year.
F : The new game is going to be released in stores next month which is expected to be the most popular military game of the year.
6. Are "that" and "which" referring back to "The new game" ? My answer is yes.
7. As shown above, is it common to place back "that-relative clause" because of the reason I gave in 4? and is this grammatically and stylistically acceptable?
8. If you provide similar examples, it would be of a great help to me.