A non-viscous, incompressible fluid initially moves through a horizontal section of pipe with steady flow. The cross-sectional area of the pipe is constant. If the pipe undergoes an increase in elevation, a) the speed of the fluid decreases and the pressure of the fluid increases. b) the speed of the fluid increases and the pressure of the fluid increases. c) the speed of the fluid remains constant and the pressure of the fluid decreases. d) the speed of the fluid increases and the pressure of the fluid decreases. e) the speed of the fluid decreases and the pressure of the fluid decreases. If the cross sectional area off pipe is constant, the velocity should stay the same, so only pressure decrease with the altitude increase right?