Chapter 13 - Vector Functions - 13.1 Exercises - Page 870: 23

Graph V.

Observing x and z, we see that $z=x^{2}$, regardless of y. We look for a parabolic cylinder propagating along the y-axis, as the curve will lie on this surface. The values for y are 1/(positive number greater than 1), so they are between 0 and 1. This gives us graph V.