In which of the following is the ceremonial and executive powers fused?

A.

Presidential system of government

B.

Federal system of government

C.

Parliamentary system of government

D.

Unitary system of government

Correct answer is A

The ceremonial and executive powers are fused in a presidential System of Government. The president is the head of state as well as the head of government. 

In a parliamentary system of government, the role of a head of state and head of government are played by two people. For instance in the UK,  the prime minister is the head of government (executive powers) while the queen is the head of state (ceremonial head)