In sand casting of hallow part of lead, a cylindrical core of diameter 120 mm and height 180 mm is placed inside the mould cavity. The densities of core material and lead are 1600kg/m3 and 11300 kg/m3 respectively. The net force ( in N ) that tends to lift the core during pouring of molten metal will be
(a) 19.7 (b) 64.5
(c) 193.7 (d) 257.6