The policy will … havoc on the economy of the nation.

Step 1: Analyze the question The sentence needs a verb that fits naturally with the noun "havoc" to show what the policy will do to the economy.

Step 2: Explain the concept (collocation) In English, some words are habitually paired. The fixed expression here is "wreak havoc", which means to cause great damage or destruction.

• wreak (verb) means to inflict or cause something harmful, e.g. "wreak havoc," "wreak vengeance."
• wreck (verb) means to destroy or ruin something directly, e.g. "wreck a car," "wreck the economy." It is not used with "havoc."

These two words look and sound alike, which is why examiners use them as a trap.

Step 3: Test each option

• A. wreak: "The policy will wreak havoc on the economy." Correct, because it is the standard collocation.
• B. promote: You promote growth or development, not havoc. It also has a positive sense that doesn't fit.
• C. produce: "Produce havoc" is awkward and is not an idiomatic English expression.
• D. wreck: "Wreck havoc" is a common mistake. You would say "wreck the economy" or "wreak havoc on the economy," but never "wreck havoc."

Step 4: Answer The correct option is A. wreak.

Tip: Remember the pairing "wreak HAVOC". Think of wreak as meaning "to bring about," and note that "wreck" already means "destroy" on its own, so it doesn't need "havoc" after it. Similar pairs to watch: wreak vengeance, wreck a ship.