In a constitutional monarchy, who usually makes the decisions about policy and economics ?

In a constitutional monarchy, AN ELECTED PARLIAMENT usually makes the decision about policy and economics;
A constitutional monarchy is a type of government in which a monarch shares power with a constitutionally organized government. Most constitutional monarchies have strictly ceremonial duties while other have some reserve power depending on the constitution. Constitutional monarch can not set public policies. 

Iwould say a, due to the fact these routes display many things that would be useful and provide explanations for how states are known.

Aman its you boy skinny pe pe