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

Multiple Choice

The semimajor axis of Pluto's orbit is almost 40 AU.The smallest parallax angle we can measure from orbiting observatories is about 0.001 arcsec.Suppose we use this technique to measure parallax from Pluto's orbit (over the course of half a Pluto "year") .What is the maximum distance we could measure?

A) 40 pc
B) 1000 pc
C) 40,000 pc
D) 80,000 pc