Answer:
Option D, 100 %
Step-by-step explanation:
Given -
Yellow bellies (Y) are dominant over green bellies (y)
Genotype of parents
Purebred yellow-bellied (homozygous) noombat - YY
Noombat that is hybrid (heterozygous) for belly color - Yy
The following offspring will be produced
YY * Yy
YY, Yy, YY, Yy
Out of four, all the offspring will be yellow-bellied offspring. However, two Noombats will be homozygous for yellow belly while the remaining would be heterozygous for the yellow belly
Thus, option D 100% is correct