The Earth's Orbit Has a Mean Radius Of $1.5 \times 10 ^ { 8 } \mathrm {~km}$

Multiple Choice

The earth's orbit has a mean radius of $1.5 \times 10 ^ { 8 } \mathrm {~km}$ . Over a six-month period, the apparent position of a particular star varies by $0.00014 ^ { \circ }$ due to parallax. How many kilometers is this star from Earth?

A) $1.2 \times 10 ^ { 17 } \mathrm {~km}$
B) $1.2 \times 10 ^ { 20 } \mathrm {~km}$
C) $1.2 \times 10 ^ { 11 } \mathrm {~km}$
D) $1.2 \times 10 ^ { 14 } \mathrm {~km}$