Let us consider each options one by one..
In register direct addressing mode effective address is the register name mentioned in the address field of instruction itself..So data is in register in place of memory..
In register indirect notation , the effective address is the content of the register name mentioned in the address field , the content being the memory address where the actual data is present..
In base indexed notation , the effective address is calculated by adding the base address which is in address field of instruction and index which is in index register..
In displacement notation or relative notation , we do either PC relative (for intrasegment tranfer of control statements) and base register relative(for intersegment transfer of control statements as in 8086 microprocessor)..There is no concept of effective address as these instructions focus on instructions not data..
Hence B) is the correct answer considering the constraint given in the question..
