If a surveying drawing is prepared at a scale of 1 cm = 4 m, then what will be the fractional scale?

Correct option is D

​$$\text{Given scale:}1 \text{ cm on drawing} = 4 \text{ m on ground}$$
$$\text{Convert ground distance to the same unit:}$$
$$4 \text{ m} = 400 \text{ cm}$$
$$\text{Fractional scale (F.S.) is:}\text{F.S.} = \frac{\text{Drawing length}}{\text{Actual length}}= \frac{1}{400}$$​​​​​