Task: Question Answering
Input (English): If \(\frac { a } { b } \) is negative, which of the following must be positive? I. \((a + b)(a - b)\) II. \(1 - ab\) III. \(\frac { b - a } { a } \)
(A)I only (B)II only (C)III only (D)I and II only (E)I,II and III
Output (English): B