The risk-free rate, average returns, standard deviations, and betas for three funds and the S&P 500 are given below.

Fund	Avg			Std Dev			Beta
B		20.5	%		30.0	%	1.35
A		14.5	%		25.0	%	1.10
C		17.0	%		20.0	%	1.15
S&P 500		11	%		16	%	1
rf		6.0	%

If these portfolios are subcomponents that make up part of a well-diversified portfolio, then portfolio ______ is preferred.

	S&P 500
	C
	A
	B