Q1(d) : The answer is C cz the going concern concept states that the business will continue to operate for the forseeable future while the matching concept states tht the costs(expenses) for an accounting period should be matched against their revenue for this period.
Q1(i) : The answer is A cz we add the $15500 (transferred to the P/L a/c) to the balance b/d on 1 Jan ($2000) and subtract the balance c/d on 31 Dec ($2500). I prefer opening a T account for electricity b4 solving such questions to make sure tht the answer is correct.