Final answer:
The correct answer is A. RYK should recognize a liability based on a reliable estimate even if the electricity invoice has not been received.
Step-by-step explanation:
The correct answer is A. A present obligation exists and RYK should recognise a liability based on a reliable estimate.
In this scenario, the accountant should recognize a liability even though the electricity invoice has not been received. According to accounting principles, a liability should be recognized when there is a present obligation arising from a past event, and it is probable that an outflow of economic benefits will be required to settle the obligation.
In this case, RYK has a present obligation to pay for the electricity usage, even though the invoice has not been received yet. The accountant can make a reliable estimate based on the past usage and recognize the liability in the financial report.