(Questions 82-90: Data Sufficiency) are followed by two statments, labeled statement I and statement II. These statements contain additional information. Select option A if statement I alone is sufficient, but statement II alone is not sufficient to answer the question. Select option B if statement II alone is sufficient, but statement II alone is not sufficient, Select option C if both statement I and II together and sufficient to answer the questions, but neither statement alone is sufficient. Select option D if each statement alone is sufficient to answer the question.

87. If x + y = 6, then what does x - y equal? (I. x² - y² = 12 / II. 2y + x = 8)