777₈ = 7×8² + 7×8¹ + 7×8⁰ = 7×64 + 7×8 + 7 = 448 + 56 + 7 = 511.
Option A:
Option A correctly computes the base-8 expansion to 511.
Option B:
Option B (512) equals 8³ and corresponds to 1000₈.
Option C:
Option C (343) is 7³ and unrelated to 777₈’s place weights.
Option D:
Option D (409) is not the correct positional sum.
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