Which word is correctly spelled according to Canadian English standards?

The correct spelling according to Canadian English standards is "colour." In Canadian English, many words that are spelled with a "u" in British English retain that spelling, distinguishing them from American English, where the "u" is often omitted. “Colour” is a prime example of this, as it reflects the British influence on Canadian spelling conventions.

The other options do not align with Canadian English standards. "Color," for instance, is the American English version of the word, lacking the "u." "Coler" appears to be a misspelling, and "Coour" is not a recognized standard spelling in either American or Canadian English. Thus, "colour" is the only correct form in this context.