See the myplug_admin_page function.
And see the selected calls inside it. selected works in a way that check the value of the item with the current saved value.
In your selected calls the current saved value should be $input['select_it'] but.. no $input variable it’s defined in that function.
In that function the current saved value is in the var $myplug_options (because of the $myplug_options = get_option('myplug_settings')).
So in selected calls replace $input with $myplug_options and I bet it will works.
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