Answer: The correct option is (B) 27 units.
Step-by-step explanation: Given that a circle has a circumference of 85 units.
We are to find the approximate length of diameter of the circle.
The circumference of a circle with diameter d units is given by

In the given circle, we have
C = 85 units, diameter, d = ?
So,

Thus, the approximate length of the diameter is 27 units.
Option (B) is CORRECT.