Concept:Parliament is the supreme law-making institution in a democratic system.
Explanation:The most important duty of a parliament is to make laws for the country.
It does this by introducing, debating, and passing bills.
Although parliament also approves taxation and controls public spending, these are supporting functions.
Impeachment of the president is a special judicial power, not the primary function.
Ratifying international treaties is usually an executive power or a secondary parliamentary duty.
Acting as an electoral college applies only in some countries and is not the core role.
Therefore, the primary function of parliament is legislation, which means the making of laws.
Answer:B. making of laws