Optimistically, the habitable zone of the Sun (a G-star) is calculated to extend from about 0.84 to 1.7 AU, while the habitable zones of more massive and luminous A-stars are calculated to extend from about 3.8 to 7.6 AU. Given that G-stars are 7 times more numerous than A-stars, what is the percentage of planets expected in habitable zones around A-stars compared to G-stars like our Sun?
A) 63 %
B) 440 %
C) 31 %
D) 4.4 %
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