In 2001 the Peruvian government began requiring tourists

In 2001 the Peruvian government began requiring tourists to buy expensive permits to hike the remote Inca Trail, which goes to the ancient city of Machu Picchu, The total number of permits is strictly limited; infact, only 500 people per day are now allowed to hike the Inca Trail, whereas before 2001 daily visitors numbered in the thousands. The Peruvian government claims that this permit program has successfully prevented deterioration of archaeological treasures along the Inca Trail.

Which of the following, if true, most strengthens the argument above?

(A)Since 2001, tourist guides along the Inca Trail have received 50% to 100% increases in take-home pay.

(B)Villages near Machu Picchu have experienced declines in income, as fewer tourists buy fewer craft goods and refreshments.

(C)Many of the funds from the sale of Inca Trail permits are used to staff a museum of Incan culture in Lima, Peru's capital, and to hire guards for archaeological sites without permit programs.

(D)Since 2001, Incan ruins similar to Machu Picchu but not on the Inca Trail have disintegrated at a significantly greater rate than those on the Inca Trail.

(E)The total number of tourists in Peru has risen substantially since 2001, even as the number of tourists hiking the Inca Trail has remained constant.

Answer is D

Can anyone please explain in detail how to get through the right answer.

Thanks & Regards
Vinni