"THE REASON IS BECAUSE ..." IS WRONG
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I probably sent you here because you used the "The reason ... is because ..."
sentence. Here is why it's wrong and how it's right:

REASONING
=========

"Because" answers are given to "why" questions:

  Q: "Why are you crying?"
  A: "Because I am sad."

  Q: "Why aren't you working?"
  A: "Because I am lazy."

To "what is" questions we give "it is" answers:

  Q: "What is that sound?"
  A: "That sound is just some noise."

  Q: "You're not working. What is the reason?"
  A: "The reason is my laziness."
     or
     "The reason is that I am lazy."

The last sentence shows the correct form of the sentence that starts with
"The reason is".

SO HOW TO SAY IT PROPERLY?
==========================

Instead of:   "The reason he cries is because he is sad."         <-- WRONG
say:          "The reason he cries is that he is sad."            <-- CORRECT
or:           "He cries because he is sad."                       <-- CORRECT
