What must be offered by someone who uses Kickstarter for a fundraising project?

	A.	They must create something to share with others.
	B.	They must offer to return the exact amount of the contributed funds within a given period of time.
	C.	They must offer to give a portion of their funds to a charity.
	D.	They must offer a moneyback guarantee if a backer decides to rescind his or her contribution.