If you looked it up online you could find it. look on safari
Both B and D are 3rd degree, but only D is a 3rd degree binomial because it has only 2 terms. The answer is D.
3,000,000+28,000+2=3,028,002
complementary angles add up to 90°, so therefore we know that ∡A + ∡B = 90°, and also they are in a ratio of 3:6.
The answer to your question is 210 combinations are possible :)