The Semimajor Axis of Pluto's Orbit Is Almost 40 Au

Multiple Choice

The semimajor axis of Pluto's orbit is almost 40 au. From its orbit around Earth, the Hipparcos satellite measured stellar parallaxes to an accuracy of about 0.01 arcsecond. Suppose astronomers use this technique to measure parallax from Pluto's orbit (over the course of half a Pluto "year") . What is the maximum distance they could measure?

A) 4 pc
B) 100 pc
C) 4000 pc
D) 8000 pc