Which of the following statements is true?

a.A person will only qualify for protection in Canada if his reasons for fear fall within the established nexus of possibilitiesnamely, race, religion, nationality, membership in a particular social group, and political opinion.

b.According to the principle of non-refoulement, refugee claimants who are guilty of a serious non-political crime cannot be removed from Canada until a final determination is made regarding their refugee claim.

c.foreign nationals who initially leave their country for economic reasons can become refugees sur place if due to change in circumstances they have valid fears of persecution and harsh punishment upon their return.

d.The new refugee determination system requires those who make refugee claims at Canadian ports of entry to attend a mandatory interview at a IRCC inland office.