The least distance of distinct vision for a young adult with normal vision is about

Ans: Option C - 25 cm

The minimum distance, at which objects can be seen most distinctly without strain, is called the least distance of distinct vision. It is also called the near point of the eye.

For a young adult with normal vision, the near point is about 25 cm. 

The farthest point up to which the eye can see objects clearly is called the far point of the eye. It is infinity for a normal eye.

Thus, for a normal eye can see objects clearly that are between 25 cm and infinity.