Event (A): Company X is opening an office in city Y for marketing the company's products. Event (B): Company X has chalked out an expansion plan, involving raising production capacity at its existing plants.

• A. If A is the effect and B is its immediate and principle cause.
• B. If B is the effect and A is its immediate and principle cause.
• C. If A is the effect but B is not its immediate and principle cause
• D. If B is the effect but A is not its immediate and principle cause.