C. it stays in the moment and is relevant, as the jungles of Vietnam.
A brings it back to the present, which was after everything so it brought down the tone.
B completely gets rid of the morbid darkness
and D there is nothing about needing to remain silent.
<span />
1. Identical twins are more likely to have roughly equal intelligence levels than fraternal twins.
2. "<span>Overall, the test scores of the identical twins were much closer together than those of the pairs of fraternal twins."
</span><span>"Ten pairs were identical twins, both developing from the same egg in their mother. The other ten pairs were fraternal twins."
The paragraphs compare the two, but show that it builds to that conclusion by showing those details. These seem like opening paragraphs too, so the final sentence would be the thesis statement. The thesis statement normally tells the reader the author's claim, so those two quotes I pointed out are its supporting details.</span>
