Which of the following products of ratios gives the conversion factors to convert metres per second

\left(\frac{\mathrm{m}}{\mathrm{~s}}\right)

to parsecs per year

\left(\frac{\text { Parsec }}{\text { Year }}\right)

? A parsec is a unit of distance used in astrophysics, and is equal to 3.26 light years. A light year is 9.46 x 1015 m.
A)

\frac{1 \text { parsec }}{3.26 \text { light years }} \frac{1 \text { light year }}{9.46 \times 10^{15} m} \frac{365 \text { days }}{1 \text { year }} \frac{24 \text { hours }}{1 \text { day }} \frac{3600 \mathrm{~s}}{1 \text { hour }}

\frac{1 \text { parsec }}{3.26 \text { light years }} \frac{1 \text { light year }}{9.46 \times 10^{15} m} \frac{365 \text { days }}{1 \text { year }} \frac{3600 \mathrm{~s}}{1 \text { hour }}

C) $Which of the following products of ratios gives the conversion factors to convert metres per second \left(\frac{\mathrm{m}}{\mathrm{~s}}\right) to parsecs per year \left(\frac{\text { Parsec }}{\text { Year }}\right) ? A parsec is a unit of distance used in astrophysics, and is equal to 3.26 light years. A light year is 9.46 x 1015 m. A) \frac{1 \text { parsec }}{3.26 \text { light years }} \frac{1 \text { light year }}{9.46 \times 10^{15} m} \frac{365 \text { days }}{1 \text { year }} \frac{24 \text { hours }}{1 \text { day }} \frac{3600 \mathrm{~s}}{1 \text { hour }} B) \frac{1 \text { parsec }}{3.26 \text { light years }} \frac{1 \text { light year }}{9.46 \times 10^{15} m} \frac{365 \text { days }}{1 \text { year }} \frac{3600 \mathrm{~s}}{1 \text { hour }} C) D) \frac{1 \text { parsec }}{3.26 \text { light years }} \frac{1 \text { light year }}{9.46 \times 10^{15} m} \frac{1 \text { hour }}{3600 \mathrm{~s}} \frac{24 \text { hours }}{1 \text { day }} \frac{1 \text { year }}{365 \text { days }} E) \frac{1 \text { parsec }}{3.26 \text { light years }} \frac{1 \text { light year }}{9.46 \times 10^{15} m} \frac{365 \text { days }}{1 \text { year }} \frac{24 \text { hours }}{1 \text { day }} \frac{60 \mathrm{~s}}{1 \text { hour }}$
D)

\frac{1 \text { parsec }}{3.26 \text { light years }} \frac{1 \text { light year }}{9.46 \times 10^{15} m} \frac{1 \text { hour }}{3600 \mathrm{~s}} \frac{24 \text { hours }}{1 \text { day }} \frac{1 \text { year }}{365 \text { days }}

\frac{1 \text { parsec }}{3.26 \text { light years }} \frac{1 \text { light year }}{9.46 \times 10^{15} m} \frac{365 \text { days }}{1 \text { year }} \frac{24 \text { hours }}{1 \text { day }} \frac{60 \mathrm{~s}}{1 \text { hour }}

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