Question

The distance from Earth to the Sun is 1.0 _____.

light year
parsec
astronomical unit
furlong

Answer 1

Well in terms of miles, the average distance from the Earth to the Sun is roughly 92,960,000 miles. So now we have to figure out which term translates to the distance of the Earth to the Sun. 1 Lightyear is around 6 trillion miles, according to Universe Today. So it's not A.
Source: http://www.universetoday.com/65644/how-far-is-a-lightyear-in-miles/

Answer 2

Let's move to Option B. A parsec is around 3.26 lightyears. So that's way off if we plug it in with what a light years is equivalent in miles.
Source: http://www.universetoday.com/32872/parsec/

Answer 3

Now an Astronomical Unit (AU) is around 92,955,807.3 miles. So now pull the pieces together. :D