What phrase signifies the increase in tourists to ancient towns?

The phrase "There has been a growth in" effectively signifies an increase in tourists to ancient towns because it explicitly conveys the idea of expansion or a rise in number. The word "growth" directly indicates a positive trend or increase, making it the perfect choice for describing an uptick in tourist activities. This is particularly relevant when discussing tourism, as it suggests more visitors are arriving, contributing positively to the economy and cultural exchange of these ancient locations.

In contrast, the other phrases reflect either negative or neutral trends that do not align with the idea of an increase in tourism. For instance, "There has always been a decline in" explicitly states that there has been a decrease, while "There is a scarcity of" indicates a lack, which also denotes a negative sentiment. Finally, "There is a reduction of" similarly points toward a decrease, reinforcing the absence of growth rather than its presence. Thus, "There has been a growth in" stands out as the clear choice for conveying an increase in tourists.