Final answer:
To convert the length of Fiona's flower bed from centimeters to meters, you divide by 100. Fiona will need 2 meters of fencing material.
Step-by-step explanation:
Fiona's flower bed is 200 centimeters in length, and she wishes to add a fence along one side. To convert centimeters to meters, she needs to divide the length in centimeters by 100, because there are 100 centimeters in a meter.
Therefore, Fiona needs enough fencing material to cover 200 centimeters, which is equivalent to 2 meters when converted. Thus, the correct answer is A. 2 meters.