In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".

[header] How to buy a checkbook calculator [title] Measure the space in your checkbook for a calculator. [substeps] The calculator should fit inside the checkbook cover without impeding the closure of the checkbook cover. Checkbook calculators come in a variety of sizes. <sep> (A) If you haven't used a checkbook all of the time, you probably don't need the calculator. If the size is larger than the width of your checkbook, however, it's probably not a good idea to purchase it. (B) If you use a larger calculator you may find you need 3 to 4 different sizes of calculator. Make sure the calculator you buy is compatible with your checkbook. (C) Generally, the most common size is 214 and the smaller an equation, the larger the calculator will be. [title] Before making your final calculation, list the amount of money you will need. (D) If possible, choose a checkbook calculator with latches. The latches hook onto the checkbook cover and helps to prevent the calculator from slipping out of the checkbook.
D