Detailed Answer
Answer (C) is correct.
The SYD method multiplies a constant depreciable base (cost minus
residual value) by a declining fraction. The numerator is the number of
years of the useful life minus the years elapsed (5 - 0 = 5). The
denominator is the sum of the digits of the years in the asset’s useful life
(1 + 2 + 3 + 4 + 5). The first year’s depreciation expense is therefore
$16,667 [$50,000 x (5 / 15)].