I just wonder _____ that delights the whole family so much. [ ]

A. what it is

B. what he does

C. how it is

D. how he does

按照我国《保险法》的规定，人身保险的被保险人因第三者的行为而发生死亡、伤残或者疾病等保险事故的，保险人向被保险人或者受益人给付保险金后，享有向第三者追偿的权利。