The Ministry of Tourism in country $\text{X}$ began an expensive television advertising campaign in country $\text{Y}$ two years ago. Since that time, the number of visitors to country $\text{X}$ from country $\text{Y}$ has increased by more than $8$ percent. Clearly, the Ministry of Tourism's campaign is responsible for the increase.
Which of the following, if true, would most weaken the argument above?
- The advertisement sponsored by the Ministry of Tourism in country $\text{X}$ were banned by the country $\text{Y}$ media for lack of imagination.
- A devaluation of the currency in country $\text{X}$ two years ago made travel there more affordable for residents of country $\text{Y}.$
- Increasing political turmoil in country $\text{X}$ will lead to a decrease in visitors from country $\text{Y}$ next year
- The number of visitors from country $\text{Y}$ to country $\text{Z}$ increased by more than $8$ percent over the past two years.