题目内容：
根据短文内容，回答题。If you own a car，you are probably considering buying some kind of car insurance(保险)．However，when you are actually purchasing car insurance，it can be difficult for you to decide which is your best choice．The ideal buying process is to first research and decide，then purchase．
Research first
Before buying car insurance，you should find out the purpose of your purchase and how the insurance meets your needs．
Decide on suitable Car Insurance Policies(保单)
A neglected part of car insurance is the part which covers medical bills．Medical payments can add up very quickly in an accident situation，and the insurance should cover the bills incurred(招致)both by you and by the passengers in your car． Make sure you know the full value that your insurance covers．
Purchase the best Car Insurance for your needs
You have a number of choices when it comes to the actual purchase of the car insurance． Each has advantages and disadvantages，and these may be influenced by your individual taste and previous buying experience． Insurance companies may offer you good advice， but prices on the Internet are often better．
According to the first paragraph，when buying car insurance，one should first________． A．decide on the number of policies to purchase
B．do careful research on the different choices
C．choose the best insurance company
D．look for the lowest insurance rate
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