Select the grammatically correct phrase to complete the tour guide's anecdote.

A tourist came up to me yesterday looking completely lost and asked me ___.

The correct answer is where the nearest restroom was.

In reported questions, we use statement word order (Subject + Verb), so "was the nearest restroom" becomes "the nearest restroom was". Additionally, because the reporting verb ("asked") is in the past tense, we backshift the verb "is" to "was".