Concept:The Chancellor of the Exchequer is the cabinet minister responsible for the UK's economic and financial matters.
Explanation:The Prime Minister appoints about 20 senior MPs as ministers to head government departments.
Each minister has a specific portfolio.
The Chancellor of the Exchequer is in charge of the economy, including taxation, spending, and financial regulation.
Other key ministers include the Home Secretary (crime, policing, immigration) and the Foreign Secretary (foreign relations).
Secretaries of State oversee areas like education, health, and defence.
Thus, among the options, only the Chancellor of the Exchequer is directly responsible for the economy.
Answer:A. Chancellor of the Exchequer