The correct option is A 21
After the step 10 READ x,y, the value of x=48,y=60
After the step 20 Let x=x3, the value of x=483=16,y=60
After the step 30 Let y=x+y+8, the value of x=16,y=16+60+8=84
After the step 40 Let z=y4, the value of x=844=21
Hence z=21 is the final output printed.