The correct answer is: $\frac{1}{10}$
Explanation
0.1 is one tenth, so its simplest fractional form is 1 over 10.
Steps:
- Write 0.1 as tenths: $$0.1=\frac{0.1\times10}{10}$$
- Simplify the numerator: $$\frac{0.1\times10}{10}=\frac{1}{10}$$
Therefore, 0.1 expressed as a fraction is $\frac{1}{10}$.