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For converting any base(say $n$) to decimal, we need to multiply the digits with their weights. And weights are equal to $n$ to the power place of the digit in the number, with respect to the radix point.

So, for converting $(0.4051)_8$ to decimal, we need to multiply the digits with their respective weights.

i.e.

$(0.4051)_8$

$= 0 \times 8^0 + 4 \times 8^{-1}+ 0 \times 8^{-2} + 5 \times 8^{-3} + 1 \times 8^{-4}$

$= 0.510009765625$

**$\approx 0.5100098$**

Hence option **(A)**