The correct answer is A. memory cycle time.
Memory cycle time is the minimum time delay required between the initiation of two successive memory operations. It is the time it takes for the memory to read or write a single data item.
Memory access time is the time it takes for the memory to respond to a read or write request. It is typically shorter than memory cycle time, as it does not include the time required to prepare the memory for the operation.
Transmission time is the time it takes for data to be transmitted from one location to another. It is typically much longer than memory cycle time, as it includes the time required to send the data over a physical medium, such as a wire or a wireless link.
Waiting time is the time that a processor must wait for data to be available from memory. It is equal to the memory access time plus the time it takes for the processor to prepare the memory for the operation.
Therefore, the minimum time delay required between the initiation of two successive memory operations is the memory cycle time.