The process that involves the removal of sulphur from the ores is:
a. Refining
b. Roasting
c. Smelting
d. Leaching

Hint: The roasting process involves heating and roasting the ore to remove the sulphur and other impurities. The ore is then ground into a fine powder used as an ingredient in fertiliser, matches, rubber, paper, etc.

Complete Step by Step Solution:
The roasting process involves heating ore to a high temperature and allowing it to oxidise, which breaks down sulphur into elemental sulphur and sulphur dioxide gas. The most common way to remove sulphur from ores is by using hot air or steam, which oxidises the ore at high temperatures. The sulphur dioxide gas then reacts with water vapour in the air and forms hydrogen sulphide gas, which can be removed by condensation or other means.

The process that involves the removal of sulphur from the ores is Roasting. The roasting process is a thermochemical reaction where sulphur and other impurities are removed from the ore by heating it to a high temperature in an oxidising environment. This process requires energy and produces large amounts of heat and smoke.
Therefore, Option B Roasting is the correct answer.

Note: Roasting is a thermochemical reaction where sulphur and other impurities are removed from the ore by heating it to a high temperature in an oxidising environment. This process requires energy and produces large amounts of heat and smoke.