Compound subject. your welcome
the answer is a. atom because Atoms are commonly used in science, rest do not and the other ones don't involve science.
I cannot read the lines, because you did not post them, however, you gave me enough to work with to understand your question.
My answer would be:
Yes, I do agree. There is no sweeter sight than a man's own native country. Just imagine soldiers coming back from war, imagine how relieved and relaxed and happy they must be to see the land they call home.<span />
