Zi kong asked, 'is there one word to serve as a rule for practice throughout life? ' confucius said, 'it is reciprocity. what you don't want done to yourself, don't do to others.'

the answer would be choice c, cave paintings.

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.