Explanation:

- The sentence mentions that a range of measures "boosted" tourism. This means that these measures helped increase or improve tourism.

- Option 1: Improve—This is similar in meaning to "boosted," as it also means to make better or enhance.

- Option 2: Raise—This means to elevate or increase, which aligns with "boosted."

- Option 3: Uplift—This similarly means to raise or elevate, matching the effect of boosting.

- Option 4: Decrease—This means to reduce or make less, which is the opposite of "boosted."

?? The correct answer is Option 4: Decrease.