the reason is you want to grab their attention back so being entertaining is most likely the way to go and having a dynamic aproach helps ensure you have youre audiences attention. being friendly, warm and open, isnt really an option whilst acting because you dont want to break charecter ecpessially if youre charecter is dark or gloomy you wouldnt want to suddenly go off script with your emotions just to gain back the crowd. which is why i think option C is the correct answer, since you can be dynamic and entertaining but still maintain charecter.
