A. It shows that Cassius thinks that Brutus is too optimistic.
What Cassius is basically asking Brutus is whether he is willing to be humiliated and be marched through the streets tied up as trophy because this is what usually happened to the defeated. What Cassius is trying to communicate to Brutus is the notion that he should consider the consequences of what were to happen should he happen to fail.
<u>Correction To the Question</u>
- The dimensions of the 6 blocks stacked are

- The dimensions of the 9 blocks stacked are
.
Answer:
- (A)Six of the one-half cubes would have a volume of 3 cubic units.
- (D)Three of the one-third cubes will make 1 unit cube.
- (E)Two of the one-half cubes will make 1 unit cube.
- (F)Both stacks will have a volume of 3 cubic units.
Explanation:
Marissa claims that stacking 6 blocks with dimensions of
will give the same volume as stacking 9 blocks with dimensions of
.
First, we examine the volume of each block.
<u>Block 1</u>
The dimensions are:
Volume of 1 block =
Volume of 6 blocks of dimension 
<u>Block 2</u>
The dimensions are:
Volume of 1 block =
Volume of 9 blocks of dimension 
The following statements out of her claim are true:
- (A)Six of the one-half cubes would have a volume of 3 cubic units.
- (D)Three of the one-third cubes will make 1 unit cube.

- (E)Two of the one-half cubes will make 1 unit cube.

- (F)Both stacks will have a volume of 3 cubic units.
Two sentences joined with a coordinating conjunction and a comma form a compound sentence. If it were a complex, it would have a dash. If it were a comma splice, it would have a dash and a dash. If it were a run-on, it wouldn't have either, just a lot of and in it.
Hope this helps. :D