The sequence on the complementary strand is B.TAACGGGTAC.
Explanation:
In DNA's molecule two complementary DNA strands interact forming a double helix by base pairing. This base pairing follows rules called "Watson-Crick base pairing". In this rule a specific pyrimidine pairs only with a specific purine, Adenine (A) with Thymine (T) and Cytosine (C) with Guanine (G).
If we Know the base sequence of one strand of DNA, we can deduce the base sequence of the other.
