Not quite. The answer is B: A connection between a potable water system and a source of actual or potential contamination
A cross-connection is any arrangement that could let non-potable water or another contaminant reach the potable system — a hose in a mop sink, a chemical feed line, an irrigation connection — not a description of a drain or vent fitting, terms it's easy for a new candidate to mix up with.
Checked against the 2021 UPC text. Washington's exam is written against the 2015 edition, which we have not read for this section, so confirm it against your 2015 book.
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