I'm a native U.S. speaker who grew up about twenty miles from New York City. All of these usages sound completely natural. Not one of them conveys any impression to me that the speaker "is British" or "isn't from around here." In contrast, this morning, for the first time in my life I actually heard someone say "uff da." It was at a highway rest stop. There was a vending machine that was accepting money, not dispensing snacks, and not returning coins. "Uff da" is a very common expression in _one_ region of the United States. U.S. speakers can probably guess what state we were traveling through.

I think you got some pretty great answers already. You can use all of those sentences in daily American life. But I did want to add this small note on casual/slang ways to say the same thing. You mentioned that you wanted to know what Americans say in daily life. In regards to the A and B, when I am speaking to my friends, I usually say, "gotta" in both sections instead of "got to" and "have to." For example: I got to get more of that >> I gotta get more of that. I have to get started with my homework >> I've gotta get started with my homework. When I am really trying to make a point, then I will put stress on the words "have to" or "got to." For example: Friend: Hey, let's go to the movies! Me: No, thanks. I gotta get home and do my homework. Friend: Dude, who cares? Let's just go! Me: I can't! I have GOT to finish this work before tomorrow. Hope you find this useful [emoji]

Likewise for British English. All of these are normal and common. British and American English are not as different as you think they are - the standard basic language is virtually identical for all English speakers wherever we are from.

All of these are normal and very common in American English. One is not more common than the others.

Hi,thank you so much zaeanderson,Jmat,Su.Ki