This question tests the understanding of the subjunctive mood, which expresses hypothetical or non-real situations. The correct answer is B, as it uses 'were' instead of 'was' to express a wish about a situation that is not true. Option A incorrectly uses 'was' in a hypothetical context. Option C uses the indicative mood instead of the subjunctive, and option D correctly uses 'were' but is not the best example of the subjunctive mood compared to B.