Which of the following words is closest in meaning to “Inversion”?

Inversion means reversal of position, order or direction.

• Correct answer - reversal: it has the same meaning as Inversion.
• introvert: a shy, inward-looking person - wrong, it does not mean the same as Inversion.
• diversification: spreading into different areas - wrong, it does not mean the same as Inversion.
• vortex: a whirling mass of water or air - wrong, it does not mean the same as Inversion.