What can be done about the missed information on N400 form paragraph 7 section C?

You will have a chance to provide this information to the officer at the time of the interview. Just be sure to have it all organized for then.

Every naturalization applicant must appear and be interviewed in connection with that application. At your interview, provide the missing information to your naturalization officer. But before you do, I suggest that you have an attorney review the impact that the missing information may have on your eligibility for naturalization.

Mistakes happen in filling out the forms. During the interview, you will likely be asked if there are any errors or omissions you'd like to correct. At that time, you can provide the travel information. It's a good idea to provide it in writing (bring at least two copies of a typed list of each trip including all the information requested on the form). If the interviewer doesn't ask you that question, be proactive about offering the information because your forms were submitted under oath and penalty of perjury. Explain the error.

Be prepared to present a list of all your absences during the interview and explain why you failed to list them. If you left that section blank (simply forgot about it), that should not be a big problem. But if you listed 0 trips outside when in reality you did travel, this could be an issue since you would be misstating the truth. You could write them a letter now and include all your trips and explain why you missed this question. If you did not travel much (so your physical presence is not an issue), there should not be a problem. But the worst thing you can do to yourself is lie on a form.