Dna sequence 5'- agt aac ggc aga ctt ctc cac agg agt cag gtg cac cat -3' mrna sequence: 5'- ' nucleotides: acgtu

5'- UCA UUG CCG UCU GAA GAG GUG UCC UCA GUC CAC GUG GUA -3'

Explanation:

As we know there are four nitrogenous bases  in DNA double helix, they are divided into two categories Purines and Pyrimidines.  

Purines:

Adenine (A) and Guanine (G)

Pyrimidines:

Cytosine (C) and Thymine (T)

Note: In case of RNA Thymine will be replaced with Uracil (U)

During Transcription, A DNA sequence is copied into messenger RNA (mRNA). As a first step the double helix molecule of DNA will unwind and one of the strands will be used as template. RNA polymerase moves along the template strand and synthesize mRNA.  

B. looks, it's the only available answer that I can see working