<u>Answer:</u>
The correct answer option is A) 42.7 units.
<u>Step-by-step explanation:</u>
We are given the radius of a circle to be 6.8 and we are supposed to find the circumference of this circle.
We know the formula for the circumference of a circle:
<em>Circumference of a circle = 2πr</em>
So substituting the given value of the radius of the circle in the above formula to get:
Circumference of the circle = 2 * π * 6.8 = 2 * 3.142 * 6.8 = 42.7
Therefore, the correct answer option is A) 42.7 units.