For the year ended December 31, a company had revenues of $187,000 and expenses of $109,000. $37,000 in dividends were paid during the year. Which of the following entries could not be a closing entry?

a) debit retained earnings 37,000, credit dividends 37,000

b) debit revenues 187000, credit income summary 187000

c) debit income summary 78,000, credit retained earnings 78000

d) debit income summary 187000, credit revenues 187000

e) debit income summary 109000, credit expenses 109000