Using Ohm's law, V=IR
for (i) : V=E, I=I1, R=r so I1=E/r
for (ii): V=E, I=I2, R=r+R1 so I2=E/(r+R1)
for (iii): V=E, I=I3, R=r+(R1+R2) so I3=E/(r+R1+R2)
for (iv): V=E, I=I4, R=r+(R1R2/(R1+R2)) so I4=E/(r+(R1R2/(R1+R2)))
Thus ,I1>I4>I2>I3 (The equivalent resistance for parallel combination is less than of each resistance )
Hence, 4.2 A is for (i), 1.4 A for (iv), 1.05 A for (ii) and 0.42 A for (iii).