What Is the Parallax Angle for Proxima Centauri, Which Is $4.3$

Multiple Choice

What is the parallax angle for Proxima Centauri, which is Earth's nearest star at $4.3$ ly? The earth's orbit has a mean radius of $1.5 \times 10 ^ { 8 } \mathrm {~km}$ , and $1 \mathrm { ly } = 9.46 \times 10 ^ { 15 } \mathrm {~m}$ .

A) $2.1 \times 10 ^ { - 7 }$ degrees
B) $1.2 \times 10 ^ { - 14 }$ degrees
C) $1.2 \times 10 ^ { - 7 }$ degrees
D) $2.1 \times 10 ^ { - 4 }$ degrees