Answer:
D GAUCCA
Explanation:
mRNA is synthesised using the DNA as a template. This is achieved through the process of complementary base pairing, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). So the complementary sequence to CTAGGT is GATCCA.
This would be correct for DNA. However, RNA does not use thymine in its sequence, instead, thymines are replaced with uracil (U). So the complementary strand of mRNA is GAUCCA
