Hello, I have answered this questions twice and feel like I have answered incorrect both times. Can you please advise. Thank you!

An insurance policy premium of USD 1,200 was paid on 2010 September 1, to cover a one-year period from that date. An asset was debited on that date. Adjusting entries are prepared once a year, at year-end. The necessary adjusting entry at the company's year-end, 2010 December 31, is:

Select one or more:

a. Prepaid insurance 400

Insurance expense 400

b. Insurance expense 800

Prepaid insurance 800

c. Prepaid insurance 800

Insurance expense 800

d. Insurance expense 400

Prepaid insurance 400