Hegra is an archaeological site in present-day Saudi Arabia and was the second largest city of the Nabataean Kingdom (fourth century BCE to first century CE). Archaeologist Laila Nehme recently traveled to Hegra to study its ancient ________ into the rocky outcrops of a vast desert, these burial chambers seem to blend seamlessly with nature.
Which choice completes the text so that it conforms to the conventions of Standard English?
