Still, i know that if i only choose one, i would choose my imagination.

the best placement for the underlined word would be:

a: where it is now
b: after the word "could"
c: after the word "choose"
d: after the word "one"

the correct answewr its b, hope it you alot whit your work qwq

the verbal in this sentence is an infinitive. when you want to know the reason of an action, you simply ask the question "why? ". once you know the reason you can answer with "because".

many times we don´t use the word "because" but we can use another expression and that is an "infinitive of purpose". example:

-why did your brother bring a book?

-he brought a book to study.

in the answer above you can see an example of an infinitive sentence, just like in the example of your text. "he couldn´t run fast enough to beat his older sister". so, the answer is infinitive.