I agree that the meaning is unclear, but this is how I see it.
We need:
Cost of stock at the beginning of the year
Cost of stock purchased
Cost of stock sold
From the original statement, we know how many cars they had in stock at the beginning of the year, and how much they cost. We need to know what they had left at the end of the year, and the cost of those cars. Only one purchase was made, but we don’t know how much each car cost, or, how many cars were purchased. We also don’t know how many cars they sold, and which cars they sold; the ones already in stock at the beginning of the year, or the ones purchased for an unknown amount.
Statement 1: Now we know the details of the purchase, but without knowing how many cars were sold, and which cars were sold, we cannot find out the cost of the stock at the end of the year. Insufficient.
Statement 2: This gives us the revenue of what was sold during the year. But it doesn’t tell us the cost of the cars that were sold. We need the details of the cost of the specific cars sold. Insufficient.
Together, without know the details regarding the cost of the cars bought, but we are still missing the cost of cars sold. Insufficient.
My choice is E. What’s the OA?