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 clean aquarium glass [title] Wipe it off. [step] If you just have some mild algae buildup on the inside of your glass, it's pretty easy to wipe it off with a sponge. Be sure to use a clean sponge that will not introduce any chemicals or detergents into your aquarium. <sep> (A) It's perfectly fine to do this while your fish are in the tank as long as you don't remove much of the water. [substeps] You can use a sponge with an abrasive side if you need a little extra scrubbing power. (B) [title] Scrub your glass with a sponge and a little bit of dish soap. [step] One large puddle of dish soap will come out in a matter of seconds. (C) [title] Separate the plexiglass after every use. [step] Research shows that algae build-up in saltwater aquariums is associated with the fish's digestive system being upset. (D) As a general rule, though, once you've cleaned all of the algae, you want to give it a good cleaning. [substeps] A simple way to do this is to use a soft brush.
A:
A