Answer:
(C) Pepin The Short
Step-by-step explanation:
In 741AD, Pepin took over from his father as Mayor of the Palace. He ruled alongside his elder brother.
In 743AD, Pepin and his brother chose Childeric to be the apparent King of the Franks. Both brothers still wielded the functional power to the throne. Childeric was just to 'appear to be' the King (unknown to him though).
In 747AD, Pepin's brother stepped down (intentionally and on his own accord). Pepin then became the only ruler of the entire Frankish territory.
In 751AD, Pepin, without full support from his clan, lured Childeric into monastery in order to remove him as the 'face of Francia'.
Pope Zacharias helped Pepin to be proclaimed King of the Franks, against all opposition.