models for two mixed numbers are shown below which equation shows the sum?

we will simply add the whole number part
This will give 3
Since, the denominators are the same, we will just pick one, then add the numerator
[tex]=3\frac{15}{12}[/tex]But, 15/12 = 1 3/12
[tex]=4\frac{3}{12}[/tex]But 3/12 can be reduced to give 1/4
[tex]=4\frac{1}{4}[/tex]Hence, the correct answer is D