A constitution that concentrates power in one unit of government is said to be

Step 1: Analyze the question The question asks for the type of constitution (or system of government) in which power is concentrated in one unit of government, usually the central government.

Step 2: Explain the concept Let's look at each option:

• Rigid constitution: This is hard to amend. It needs a special procedure, such as a two-thirds or three-fourths majority. It says nothing about where power is located.
• Unitary constitution: All powers are vested in a single central government. Any regional or local units exist only because the central government creates them and can change or remove them. Examples are Britain (broadly) and Ghana.
• Confederal constitution: Power rests mainly with the member states, and the central body is weak. This is the opposite of concentrating power in one unit.
• Flexible constitution: This is easy to amend, often by the ordinary legislative process. Like "rigid," it describes how easily the constitution can be changed, not how power is distributed.

Step 3: Solve The question is about the distribution of power, not the amendment procedure. Power concentrated in one central unit is the defining feature of a unitary constitution.

Step 4: Answer The correct option is **B.

Tip: Link the words to their meanings:

• Unitary → uni = one, so one center of power.
• Federal → power is shared between the center and the regions.
• Confederal → power rests mainly with the states.
• Rigid/Flexible → how hard or easy it is to amend, not about power distribution.

If a question mentions "amendment," think rigid or flexible. If it mentions "power distribution," think unitary, federal, or confederal.