Final answer:
The correct primary identification document for Canadian citizens is a Canadian passport. A US driver's license, green card, and bank statement are not valid primary identification documents for this purpose.
Step-by-step explanation:
Canadian citizens must provide one of possible documents for primary identification. Among the options listed, the correct answer is a) Canadian passport. This is because a Canadian passport is an official travel document that also serves as proof of citizenship and identity, both in Canada and abroad. A US driver's license, while a valid form of identification in the United States, is not a proof of Canadian citizenship. Similarly, possessing a green card indicates that an individual has the right to live and work legally in the US, which is unrelated to Canadian citizenship. Furthermore, a bank statement would not serve as a primary identification document as it does not contain a photo or the security features necessary to confirm identity.