The best possible way to test the paternity of a child would be to
a) compare the entire genome of the father and the child.
b) compare only a particular marker dna, which is present in both the genomes.
c) compare a small number of short sequences of dna derived from the father and the child’s genomes.
d) observe the number of complimentary base pairs formed between the father’s dna and the child’s dna.

The answer is "C"  compare a small number of short sequences of DNA that are often the same between the father and the child’s genomes.

Explanation:

Comparing a single marker DNA could be misleading as there are millions of base pairs. Comparing all of them is quite time-consuming and impractical. So the best option is to compare a small number of short sequences of DNA that are often the same between the father and the child’s genomes. that are known to vary among individuals a great deal, and look for a match.

thinking it would be fimbriae