The correct answer is: $\frac{3}{8}$
Explanation
We convert the decimal to a fraction by writing it over a power of 10 and then simplifying.
Steps:
- Write the decimal as a fraction: $$0.375 = \frac{375}{1000}$$
- Simplify by dividing numerator and denominator by their greatest common divisor (125): $$\frac{375}{1000} = \frac{375\div125}{1000\div125} = \frac{3}{8}$$
- Check by converting back: $$\frac{3}{8} = 0.375$$
Therefore, $0.375$ as a fraction in simplest form is $\frac{3}{8}$.