Risk is a situation in which a decision maker

Which of the underline expressions is the hedging of ...

单项选择题Which of the underline expressions is the hedging of the following sentences.
For our present purpose, it is useful to distinguish two kinds of chemical reaction, according to whether the reaction releases energy or requires it.

A． For our present purpose, it is useful to distinguish two kinds of chemical reaction, according to whether the reaction releases energy or requires it.
B． For our present purpose, it is useful to distinguish two kinds of chemical reaction, according to whether the reaction releases energy or requires it.
C． For our present purpose, it is useful to distinguish two kinds of chemical reaction, according to whether the reaction releases energy or requires it.
D． For our present purpose, it is useful to distinguish two kinds of chemical reaction, according to whether the reaction releases energy or requires it.

不能用稀硫酸代替盐酸制取二氧化碳。()

判断题不能用稀硫酸代替盐酸制取二氧化碳。()

管理会计报告与财务报告一样，都是对外报告。( )

判断题管理会计报告与财务报告一样，都是对外报告。( )

Risk is a situation in which a decision maker has neither certainty nor reasonable probability estimates.