The correct answer is: B. BX
The 80286 processor has a 16-bit data bus and a 24-bit address bus. It has 16 general-purpose registers, 8 segment registers, and 4 special-purpose registers. The 80286 processor also has a 16-bit instruction set, which is compatible with the 8086 instruction set.
The BX register is a general-purpose register that can be used to store data or to hold the address of a memory location. It is also used as the base register for the segment registers.
The AH and AL registers are also general-purpose registers, but they are used to store data in a specific format. The AH register is used to store the high byte of a 16-bit value, and the AL register is used to store the low byte of a 16-bit value.
The EL register is not a general-purpose register. It is a segment register that is used to store the address of the current code segment.
Therefore, the only register that is the same in the 80286 and 8086 processors is the BX register.
