Ithink it's a which of the following sentences is correct? i stayed up all night doing homework; however, i just couldn't concentrate. i stayed up all night doing homework, however i just couldn't concentrate. i stayed up all night doing homework however, i just couldn't concentrate. i stayed up all night doing homework, however. i just couldn't concentrate.

The point of view that london uses in white fang the reader understand the perspectives

Aman lives on the twelfth floor of an apartment building. every morning he takes the elevator down to the lobby and leaves the building. in the evening, he gets into the elevator, and, if there is someone else in the elevator -- or if it was raining that day -- he goes back to his floor directly. otherwise, he goes to the tenth floor and walks up two flights of stairs to his apartment.

Who wants brainlest f