Montague Fellowship Church received $11$ letters from the Internal Revenue Service stating $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.$

$($A$)$ The church was being audited

$($B$)$ The church had multiple years of unpaid payroll taxes

$($C$)$ The IRS made an error on its $2018$ tax return

$($D$)$ The IRS wanted to confirm that Montague received their tax refund check