Q: 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 make an electrophoresis gel [title] Find the gel concentration required. [step] This must be specified by the physician and will vary based on the type of testing required by the study the physician is performing. Common concentrations are 0.7 percent. <sep> (A) Select the combination of percentages per hour. [substeps] It might be necessary to download an experimental amount for each electrophoresis injection to make sure there are no errors or issues. (B) 0.8 percent , 1.0 percent and 1.2 percent. [title] Obtain an electrophoresis gel casting tray. (C) [title] Solve the red side of the gel neutrality problem using the example levels of the red test. [step] This is usually found on this test table. (D) You can use a philips gel from your local pharmacy in some cases, but these can affect students' ability to interpret the microstrand packets the physician will use in the later stages. Your chemistry test must provide concentration in the forms that the pharmacy suggests.
A:
B