You could do something like this. It opens the report with a WhereCondition argument instead of passing the condition to the query.
Private Sub cmdReport_Click()
Dim strIn As String
Dim i As Integer
For i = 1 To 4
If Me.Controls("opt" & i) = True Then
strIn = strIn & ", " & i
End If
Next i
If strIn = "" Then
MsgBox "Please select at least one quarter!", vbExclamation
Exit Sub
End If
strIn = "Qtr In (" & Mid(strIn, 3) & ")"
DoCmd.OpenReport "rptSomething", acViewPreview, , strIn
End Sub
Substitute the correct names where needed.
BTW I’d use check boxes. Option buttons are intended for mutually exclusive choices, and check boxes for situations where the user may select multiple options.