In order to prove that your cause-and-effect relationship exists, it is important to explain the connection in clear language find another cause-and-effect relationship similar to yours explain the meaning of your terms clearly include evidence to support your claim

I think the answer is D)Include evidence to support your claim

Most likely, the answer is to "include evidence to support your claim". In English (and all real-world situations), it's a vital of you to include your evidence as to why you believe you are correct or why a certain situation or aftereffect is assumed to occur. I hope you found this useful. (Sorry if I'm wrong.)