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 breed tarantulas [title] Get a mature pair of tarantulas. [step] This can be a tricky part unless they are all mature. Males that are mature will have mating hooks on their first pair of legs and females have a flap of skin (spermacae) between their book lungs. <sep> (A) [substeps] Generally, a healthy tarantula will have two sets of eyes and ears as well as two, full sets of open legs. You may need two new pairs of legs for each breeding pair. (B) Males (with underbellies) will have two separate sexual organs in their first pair of wings, like the penis and vagina. [substeps] You don't want to squeeze your fastest breeding pair with three females! For the males to survive, it means they need to be in their original pairs of wings. (C) They are male, so you can remove this flap early on in the breeding season. [title] Start breeding tarantulas at least 30 days before the wedding date. (D) [title] Have the female in a larger cage than usual and leave her to settle down [title] Once she has settled down feed her a little bit more often. [title] About a week before the pairing, put the male in a smaller container and make sure it is concealed.
D