Constitutional monarchy is practised in

Analyze the question: We need the pair of countries that are both constitutional monarchies, meaning a monarch is the head of state but their powers are limited by a constitution.

Concept: In a constitutional monarchy, the king or queen reigns but does not rule absolutely. A constitution, and usually an elected parliament, limits their powers. Examples include Britain, Spain, Japan, Morocco, and Jordan. This differs from an absolute monarchy (e.g. Saudi Arabia, Eswatini), where the monarch holds nearly all power.

Check each option:

• A. Morocco and Britain: Britain is the classic constitutional monarchy, with the monarch as head of state and Parliament governing. Morocco is a monarchy under a constitution (the 2011 constitution is the latest), with a king, a prime minister and a parliament. Both fit.
• B. Australia and Tunisia: Australia is a constitutional monarchy, since the British monarch is head of state. Tunisia is a republic, so this fails.
• C. Saudi Arabia and Libya: Saudi Arabia is an absolute monarchy. Libya is not a monarchy today (the monarchy ended in 1969). This fails.
• D. Austria and Algeria: Both are republics. This fails.

Answer: Option A. Morocco and Britain are the only pair in which both countries are constitutional monarchies.

Exam tip: In these questions, find the republics first and eliminate them. Tunisia, Algeria, Austria, and Libya are republics, which leaves only A. Also remember that Saudi Arabia is the usual example of an absolute monarchy.