However, there is a slight problem with it. You must name your
controls with a name beginning by "OptionButton" or "TextBox", etc...
If you change your naming convention let's say "Opt1" or "txtName"
for example, your code  is not going to work.
So, I would advise you to use the following:

For Each ctl In UserForm1.Controls
If TypeName(ctl) = "OptionButton" Then
ctl.Value = false
End If
Next ctl