Can you guys me with this question i need it asap

Canada economy usa test prep i am stupid i don’t get it

The belmont principle of beneficence requires that: a. subjects derive individual benefit from study participation.b. potential benefits justify the risks of harm.c. the study makes a significant contribution to generalizable knowledge.d. risks are managed so that they are no > minimal.

What period of history refers to the time when people did not have written records