Complete the sentence using the most appropriate option:
I don't mind you ________ the phone as long as you pay for all your calls.

Option (a.), 'being', refers to the state or fact of existing.
Therefore, option (a.) is wrong because it isn't synonymous to ‘utilize’ and isn't relevant to the context of the sentence, since one cannot ‘be’ a phone.
Option (b.), ‘working', refers to performing or capable of performing.
Therefore, option (b.) is inaccurate because it isn't synonymous to ‘utilize’ and isn't relevant to the context of the sentence, since one cannot ‘work’ a phone.
Option (c.), ‘using', refers to the employment or exercise of something for a purpose.
Therefore, option (c.) is correct because it is synonymous to ‘utilize’.
Option (d.), ‘making', refers to the act that ends up in something coming to be.
Therefore, option (d.) is inaccurate because the speaker doesn't shall say that he/she wouldn’t mind if the person would create/make the phone.