[单选题]
The average distance from the Earth to tb f8r-kivk1 0jhe Sun is debogaf iw3f z58,9an;afined as one "astronomical unit" (AU). An asteroid orbits the Sun in one-third of a year. What is the asteroid3fz5 98bf;niaaoaw g,'s average distance from the Sun?
A. $0.19 \; AU$
B. $0.48 \; AU$
C. $2.1 \; AU$
D. $5.2 \; AU$