One part of the following sentence has an error. Choose that part -

The correct answer is Option (2) → to suspend sold

After the verb suspend (to stop for a time), an object is needed: a noun such as sale. "Sold" is the past form of the verb "sell" and cannot be the object of "suspend".

Option 1: Jewellery retailers across India decided — No error.

Option 2: to suspend sold — Error. "sold" should be the noun "sale" (or "sales").

Option 3: of gold coins — No error.

Option 4: and bars for six months. — No error.

Corrected: Jewellery retailers across India decided to suspend sale of gold coins and bars for six months.
Example: The shop has stopped the sale of plastic bags.