If the opening balance of rent accrued at the beginning of the year...

If the opening balance of rent accrued at the beginning of the year was​ $1,000, rent expense for the year was​ $20,000 and the closing balance of rent accrued at the end of the year was​ $1,200 the amount paid in cash for rent during the year​ is:

A.20200 B.21000 C. 19800 D.22200