Answer:
I believe the answer is a missense mutation.
Explanation:
As it is a point mutation, a single nucleotide will provide a codon for a different chain of amino acids from that point on. This is a type of non-synonymous substitution.
I think D, a cow grazes in a grassy meadow.
The example talks about a frog that eats a fly, and something similar could be a cow eating grass.