The correct option is
C Execute
To carry off means to perform or manage successfully.
To “execute” means to put a plan into action successfully. Hence option C is the correct answer.
“Kill” means to take the life off by murder, hence incorrect.
“Captivate” means to catch hold of, answer take in possession, hence incorrect.
“Promote” means to support or actively encourage, hence incorrect.
“Accomplish” means to attain or complete something successfully.