When roughing in a two-handle lavatory faucet under the UPC, on which side does the hot water supply connect?
Not quite. The answer is D: Left
The UPC puts the left-hand control of a two-handle faucet (as you face the outlet) on hot water, and faucets and diverters must be piped so hot lands on the left side of the fitting. An inspector will fail a reversed installation on sight, since it breaks the expectation every user relies on.
Reference: UPC 2021 §417.5 (Separate controls for hot and cold water)
Checked against the official text
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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