问题如下：
Why is technical analysis especially useful in the analysis of commodities and currencies?
选项：
A.Valuation models cannot be used to determine fundamental intrinsic value for these securities.
B.Government regulators are more likely to intervene in these markets.
C.These types of securities display clearer trends than equities and bonds do.
解释：
A is correct.
Commodities and currencies do not have underlying financial statements or an income stream; thus, fundamental analysis is useless in determining theoretical values for them or whether they are over- or undervalued.
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