The correct answer is D. : Does someone... know.
Someone needs a singular for of the verb, as it refers to a single person.
In A. the mistake is that "Few" refers to multiple people so it needs a plural form, in B. one (of those...) requires singular and C. "several" requires plural
- and they all have the wrong number.
I think it’s c. less than one month
Conditional mood, but not sure
Answer:
My router broke and we had to buy a new one
the correct conjunction is "which"
