Discussion
A design must reach 20 Mbit/s to a single flash memory over the shortest possible connection. The interface is
Answer: B
Correct answer: SPI
SPI runs at tens of megahertz with a dedicated clock and separate data lines, so 20 Mbit/s is routine for it, and a single device on a short connection is exactly the case it suits - one chip select, no addressing, no negotiation. I2C is limited to 1 or 3.4 Mbit/s in its faster modes, a UART is far slower and needs matched baud rates, and CAN is a differential multi-node bus for metres of noisy cable rather than centimetres of board.
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