Which of the following sentences from the paragraph contain a comparative adjective? Choose two that apply.
a.The long hatch popped open and there they were.
b.We stood stunned, our hearts applauding their arrival with every beat.
c.But even though we had the best technology in the universe, a trick of the eye caught us out.
d.In the video images, they had appeared to be a bit taller than we are, relative to the things in their environment.
e.It appeared, however, that their trees were much, much shorter than ours, because the aliens were much, much shorter than we are.