A) the Integrand Is Independent of Time
B) the Limits

Multiple Choice

$$\text { For a fixed control volume, the reason why } \frac { d } { d t } \int _ { \text {c.. } } \rho \eta d V = \int _ { \text {c. } . } \frac { \partial } { \partial t } ( \rho \eta ) d V \text { is: }$$

A) The integrand is independent of time
B) The limits of integration are independent of time
C) The flow is a steady flow
D) The quantity ρη is independent of position