Given in the figure are two blocks \( A \) and \( B \) of weight \( 20 \mathrm{~N} \) and \( 100...

Given in the figure are two blocks \( A \) and \( B \) of weight \( 20 \mathrm{~N} \) and \( 100 \mathrm{~N} \), respectively. These are being pressed against a wall by a force \( F \) as shown in the figure. If the coefficient of friction between the blocks is \( 0.1 \) and between block \( B \) and the wall is \( 0.15 \), the frictional force applied by the wall on block \( B \) is
[JEE (Main) 2015]
(a) \( 100 \mathrm{~N} \)
(b) \( 80 \mathrm{~N} \)
(c) \( 120 \mathrm{~N} \)
(d) \( 150 \mathrm{~N} \)