A Comet Is Discovered in an Elliptical Orbit Around the Sun

Multiple Choice

A comet is discovered in an elliptical orbit around the sun. Its closest distance from the sun is $1.0 \mathrm{AU}$ , and measurements of its speed at this distance imply that its greatest distance from the sun is $7 \mathrm{AU}$ . About how many years will pass between the comet's approaches to the sun?

A) 8 y
B) $16 \mathrm{y}$
C) $22.6 \mathrm{y}$
D) $64 \mathrm{y}$
E) 226 y
F) Other (specify)