It is often ____ the passenger to know _____ demands can be made in order to get compensation as soon as possible.
A.
up with...what
B.
up to...how much
C.
up to...what
D.
up with...which
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【单选题】The total utility from consuming five cups of coffee is 15, 27, 37, 46, and 54 utils, respectively. The marginal utility of the fourth cup of coffee is: