George, Sergio, Kim, Nicolas, Michael, Joan, and Orlando are welders. Four of these welders will be hired to seal the nuclear waste containers used at Hanford waste site. The four must pass a high-level security clearance in addition to passing a rigorous weld test.
The four are to be chosen according to the following conditions:
If George or Sergio passes the weld test, the other will pass; if either fails, they both fail.
If Nicolas or Kim passes the security clearance, the other will pass; if either fails, they both fail.
If Nicolas or Sergio passes the weld test, the other will pass, too.
If Michael or Joan fails the security clearance, the other will pass.
Orlando and George passed the security clearance.
Michael and Sergio passed the weld test.
Kim passed security clearance.
Orlando passed weld test.
Joan fails security clearance.
Which of the following could be a list of welders hired to seal nuclear containers?
a. Nicolas, Sergio, Joan, Kim
b. Joan, Michael, Kim, Sergio
c. Michael, George, Nicolas, Orlando
d. Orlando, George, Michael, Sergio
Would the answer be C ?