SBI PO Prelims 17 Dec 2022 Shift 2 Paper

In the following question, out of the four alternatives, select the alternative which will improve the underlined part of the sentence. In case no improvement is needed, select “No improvement”.
The assignment has been immeasurable, it's like everything needs to be done right now, last night I’ve probably drunk eight shots of vodka to stay awake, that why I’ve got a hangover today and lots of body ache.