We can use the property of logarithms that states:
$$\log_{a}(b^c) = c \log_{a}(b)$$
Using this property, we can rewrite the expression for log\(_x\) 8 as:
$$\log_{x}(8) = \log_{x}(2^3) = 3\log_{x}(2)$$
We are given that log\(_x\) 2 = 0.3, so we can substitute this value:
$$3\log_{x}(2) = 3(0.3) = 0.9$$
Therefore, the value of log\(_x\) 8 is 0.9.
Therefore, option (C) is the correct answer: 0.9.