Answer:
C. TGTCAGCTACGT
Step-by-step explanation:
In Chargaff's Rule (or the Complementary base pairing rule):
~ Adenine (A) pairs with Thymine (T)
~ Cytosine (C) pairs with Guanine (G)
Because of this rule, with one strand of DNA already having the sequence of ACAGTCGATGCA, The other strand of DNA can only be a sequence that pairs the nitrogenous bases with their assigned pair/base.
Thus, the answer being TGTCAGCTACGT