Read the excerpt below and answer the question.
It remained, then, to conclude that it was put into me by a nature truly more perfect than was I and possessing in itself all the perfections of what I could form an idea—in a word, by God . . . for if I had existed alone and independent of all other, so that I had of myself all this little whereby I participated in the Perfect Being, I should have been able to have in myself all those other qualities which I knew myself to lack. (Discourse on Method)
The best inference from the passage is that God must exist because otherwise Descartes, as an imperfect being, ________________________.
would not exist
would be God
would lack no advantageous qualities
would have no knowledge of the idea of perfection