Step$8.$ Right$-$click the option button to select it and reveal options to edit it$.$

Select

Edit Text, and write Feet to Meters to replace the default text

Step$9.$ You can select the option button, copy and paste it to create a second

option button, or just create another using the previous steps. Change its

text to Meters to Feet

Step$10.$ Select the two option buttons and use their handles to move them to

occupy the merged cells B$3$ & C$3.$ Arrange them suitably to give them a

nice look.