According to the rules of subject-verb agreement, phrases or clauses between the subject and the verb do not change the number of the antecedent. Therefore, the answer is number of the antecedent.
A tariff refers to a tax that is levied on an imported good and which makes the imported good to be more expensive than similar domestic goods. The disadvantages of tariff include the following:
1. Tariff discourages competition in the market, by favoring domestic goods, this leads to reduction in products' quality.
2. Tariff raises the prices of imported goods which leads to decrease in consumer surplus.
The three types of verbal phrases are participial, gerund, and infinitive phrases
