The ancient Inca city of Macchu Picchu, perched on a ridge in the Andes Mountains of Peru, had been built at a high enough altitude that it often makes modern-day tourists from lower elevations sick with oxygen deprivation.
had been built at a high enough altitude that it often makes modern-day tourists from lower elevations sick with oxygen deprivation
had been built at so high of an altitude that it often makes modern-day tourists from lower elevations sick from oxygen deprivation
was built at a high enough altitude that modern day tourists from lower elevations often become sick with oxygen deprivation when visiting the city
was built at such a high altitude that modern-day tourists from lower elevations often become sick from oxygen deprivation when visiting the city
was built at so high of an altitude that it often makes modern-day tourists from lower elevations sick from oxygen deprivation
The correct choice is D. Can someone provide clear rules for using the following idioms:
1) enough X that Y
2) such a(n) X
3) so X that Y
I understand the other issues with this sentence (tense, etc.)