Area of rectangle = length × breadth, so breadth = area ÷ length.<br><br>
&bull; Breadth = 350.6 ÷ 20<br>
&bull; 350.6 ÷ 20 = 17.53<br>
&bull; Breadth = 17.53 cm<br>
<br>
Final Answer: B: 17.53 cm