remember—
there are NO 'tricks' on this exam.
really, none.
this is a core principle upon which the exam is built. the presence of even a single 'trick question' would greatly compromise the value, and integrity, of the test.
(even if a 'trick question' were created purely by accident, it would fail the experimental phase and thus would be tossed before it could affect anyone's score.)
here, specifically, this means that things that look plural are plural, and things that look singular are singular.
the ONLY exceptions will be...
1/
exceptions that are, UNQUESTIONABLY, common knowledge
e.g.,
• any educated english speaker knows that 'the United States' is singular
• any educated english speaker knows that 'physics' is singular
etc.
2/
exceptions that are VERY clearly implied by context
e.g.,
The French typically drink wine; the British generally prefer beer.
Ordinary people cannot afford the standard of healthcare that the rich take for granted.
here it is 100.0000 percent crystal-clear that 'the French', 'the British', and 'the rich' are plural—even if you have never before seen such a construction.
3/
exceptions demonstrated by existing grammar
look at #85 in the 13th/2015 edition of OG (can't reproduce here).
in that problem, 'owning and living' is singular.
this is not necessarily obvious in context (it's reasonable to regard these as one idea, but it's also reasonable to regard them as two ideas), but it is established by the fact that 'owning and living' is the subject of 'is'.