The given expression involves simplification of a product. We are looking for terms in this product that have only a single occurrence of x and the rest of the terms are j/s.

Option 1: 2ia

This option does not provide any meaningful information regarding the number of terms that meet the specified conditions.

Option 2: 10

This option suggests that there are 10 such terms in the given expression that have only a single occurrence of x and the rest of the terms are j/s.

Option 3: 20

This option suggests that there are 20 such terms in the given expression that meet the specified conditions. However, there is no evidence or calculation provided to support this claim.

Option 4: 1

This option suggests that there is only one term in the given expression that has only a single occurrence of x and the rest of the terms are j/s.

The correct answer is option 2: 10. This means that there are 10 terms in the given expression that have only a single occurrence of x and the rest of the terms are j/s.