Given the task definition and input, reply with output. 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 know what fertilizer to use on your garden plants and when to use it [title] Decide between organic and conventional fertilizer. [step] A broad and important choice you'll be confronted with is whether to use organic or inorganic fertilizer. Fertilizer not marked as " organic " is typically petroleum-based, and should not be used in organic gardens. <sep> (A) Inorganic fertilizer includes chemicals that are biodegradable. It should be suitable for the type of plants you're getting. (B) There are two primary ethical reasons why this approach may be beneficial for lawns. [substeps] Organic mulch keeps the soil moist and insulates it from the elements. (C) The more elaborate the fertilizer, the more fertilizer you'll reap out of the process. [substeps] Organic fertilizers that are labeled as " organic " are not regulated as doing so can kill organically grown plants. (D) Organic fertilizer can come from many sources, including animals (e.g. manure), plants (e.g.
D