Answer
The distance from the Earth to the Sun is 1.57 x 10$^{-5}$ lightyears.
Work Step by Step
We know that 1pc = 3.26156 light years, so we simply convert from (a)
$(4.9\times10^{-6}pc)(\frac{3.26156ly}{1pc})=1.57\times10^{-5}ly$
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