Correct choice is (c) Calcium silicate and aluminium silicate
The best explanation: Blast furnace slag is the mixture of Calcium silicate and aluminium silicate. Ground-granulated blast-furnace slag is obtained by quenching molten iron slag (a by-product of iron and steel-making) from a blast furnace in water or steam, to produce a glassy, granular product that is then dried and ground into a fine powder.