• RAM stores data and its output depends on what was written earlier, so it has memory. That makes it a sequential circuit. So (B) is true and (A) is false.
• A PLA (Programmable Logic Array) is an AND–OR array with no memory elements. Its output depends only on the current inputs, so it is a combinational circuit. So (C) is true and (D) is false.

Answer: (B) (B) and (C) only