Answer:
The correct answer to the question: When you´re in doubt about how to cite a source, what should you look at first, would be, A: Core elements.
Step-by-step explanation:
According to the latest version of the MLA, and other such platforms which establish the correct ways in which works used in academic writing must be cited, whenever a writer is in doubt as to how to cite a document, or a text that has been used, they should first direct their attention towards the core elements. In order for a citation to be correct, these core elements must be present: author, title of source, title of container, other contributors, version, number, publisher, publication date and location. The citation must follow the same order as that list, but if one of the elements is not present, then the writer will skip that particular piece of information and follow with the others.