1. The problem asks for the first four terms of a sequence, with four given options: A (1, -3, 1, -3), B (3, 1, 3, 1), C (1, 3, 1, 3), and D (-1, 3, -1, 3). 2. To determine the correct answer, we need the explicit formula or rule of the sequence, which is not provided. 3. Without the sequence rule, we cannot verify which option correctly represents the first four terms. 4. Please provide the sequence definition or formula so we can find and verify the first four terms accurately.