Thank you for coming to Brainly with your questions!
I believe the answer is:
A. 2 cm. because to find the area of the rectangle, you multiply length times width, so to find what the length is, you divide the width by the area, which is 2 cm.
I hope this helps you! Please mark me Brainliest! Lemme know if I can help with any further questions!
~Belle
