(C) In a $DNA$ strand,the $5'$ end refers to the end where the $5^{th}$ carbon atom of the deoxyribose sugar is not involved in a phosphodiester bond

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The fifth carbon of pentose sugar is free

(C) In a $DNA$ strand,the $5'$ end refers to the end where the $5^{th}$ carbon atom of the deoxyribose sugar is not involved in a phosphodiester bond with another nucleotide,leaving it free (often attached to a phosphate group). Similarly,the $3'$ end is the end where the $3^{rd}$ carbon of the pentose sugar is free.