To solve the problem starting from the given equation [tex]\(\log 300 = a\)[/tex], let's begin by understanding the logarithmic function.
[tex]\(\log b = x\)[/tex] means that [tex]\(10^x = b\)[/tex]. Here, [tex]\(b\)[/tex] is 300, and [tex]\(x\)[/tex] is [tex]\(a\)[/tex].
Therefore, if [tex]\(\log 300 = a\)[/tex], it implies:
[tex]\[10^a = 300\][/tex]
This matches the mathematical representation given in option C.
Hence, the correct answer is:
C. [tex]\(10^a = 300\)[/tex]