Question

manganese is a strategic mineral.
what does this mean is true about manganese?
manganese is a crucial element in weapons manufacturing
nations that want manganese must import it
supplies of the mineral are unknown in quantity and location
world demand for manganese is greater than world supply

Explanation:

A strategic mineral is one that has important applications in areas like national security, including weapons manufacturing. Let's analyze each option:

• Option 1: Manganese is used in steel production, including for weapons, so being a strategic mineral could mean it's crucial in weapons manufacturing.
• Option 2: Nations can have domestic sources of manganese; "must import" is incorrect.
• Option 3: Strategic minerals' supplies are often known (for security planning), so "unknown" is wrong.
• Option 4: Strategic doesn't directly mean demand > supply; it's about importance in strategic sectors.

Answer:

A. manganese is a crucial element in weapons manufacturing