Do not just write "a", "b", or "c". Use the correct terms to describe their relationship.
a) CH$_3$-CH$_2$-CH$_2$-CH-CH$_3$ and CH$_3$-CH-CH$_2$-CH$_3$
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CH$_3$ CH$_3$
b) CH$_3$-CH$_2$-CH$_2$-CH$_2$-CH$_3$ and CH$_3$-CH-CH$_3$
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CH$_2$
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CH$_3$
c) CH$_3$-CH$_2$-CH$_2$ and CH$_3$-CH-CH$_2$-CH$_3$
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CH$_3$ CH$_3$
d) CH$_3$ CH$_3$ and CH$_3$-CH-CH$_2$-CH$_3$
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C C CH$_3$
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CH$_3$ CH$_3$