The form in (C) is called the "bare infinitive". It was more common in the past, but we still use it after a few specific common verbs: causative verbs: make, let, and help [for help, the normal infinitive and bare infinitive are both OK, but the bare infinitive is better] sensing verbs: see, smell, hear, feel Examples: I made him do his homework I let him eat ice cream I helped the old lady cross the road. I saw him swim I heard her yell I felt it move. I smelled him burp.

Hi Rafael When you use the verb 'make' in this way, you need to use the bare infinitive, not the full infinitive, so answer 'c' is correct. The bare infinitive is the infinitive without 'to' e.g. get up, and the full infinitive is the infinitive form with 'to' e.g. to get up. Ellie.