24 bit=3byte
so we have to find a adress which is start location+multiple of 3(because pc increments 3 bytes each time)
here:400=300+multiple of 3 (not possible)
500=300+multiple of 3 (not possible)
700=300+multiple of 3 (not possible)
600=300+multiple of 3 (possible) because300+3*100=600
600 IS THE ANS