Read this excerpt from President Nixon's resignation speech, and then answer the question that follows: Good evening:

This is the 37th time I have spoken to you from this office, where so many decisions have been made that shaped the history of this Nation. Each time I have done so to discuss with you some matter that I believe affected the national interest. […]

I have never been a quitter. To leave office before my term is completed is abhorrent to every instinct in my body. But as President, I must put the interests of America first. America needs a full-time President and a full-time Congress, particularly at this time with problems we face at home and abroad. […]

Therefore, I shall resign the Presidency effective at noon tomorrow. Vice President Ford will be sworn in as President at that hour in this office.

As I recall the high hopes for America with which we began this second term, I feel a great sadness that I will not be here in this office working on your behalf to achieve those hopes in the next 2 1/2 years. But in turning over direction of the Government to Vice President Ford, I know, as I told the Nation when I nominated him for that office 10 months ago, that the leadership of America will be in good hands.

What is the significance of the tone President Nixon uses in this speech?

He uses a casual tone to express anger and frustration, but he follows this up with a positive look for the future.
He uses a formal tone to express sorrow and disappointment, but he follows this up with a positive look for the future.
He uses a formal tone to express confusion and fear, and he follows this up with a negative look for the future.
He uses a casual tone to express distrust and change, and he follows this up with a negative look for the future