Where does most of a solar system cloud's mass finishing up after forming a solar system?

I don't expect you to do my homework, but could anyone direct me to a valid resource to search for the answer, or can anyone explain what is what?
When a roomy cloud pulls together to form a solar system, it flattens into a disc. Most of the cloud's mass ends up:
A. Far out in the disc where on earth gas giants form
B. In the center of the disc where on earth a star forms
C. On the edge of the disc where on earth icy objects like KBOs form.
D. Close to the center of the disc where on earth terrestrial planets form.
Thanks for any lend a hand!

Answers:    This question is ridiculous and uniformed. It's really different for each sun. For ours, I presume A is the answer. But some stars- most, actually, that we've found- own giant planets closer to the star. It's really not picky.

EDIT: Wait. I misinterpreted the question. Are they discussion about the solar SYSTEM or in recent times its planets? Because if it's the whole system, the answer is B. Sorry in the region of that. But what I said earlier still stands firm. Planets can be concentrated anywhere within the stystem.
B, the sun comprises over 99% of the solar system


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