If round seed shape (RR) is dominant over wrinkled seed shape (rr) and yellow cotyledon is dominant (YY) over green cotyledon (yy), then in a Mendelian dihybrid cross when heterozygous round yellow seeds (RrYy) are self crossed, round green off-springs are represented by the genotype RRyy, RRyy.
So, The correct option of this question is (D).