Salt deposits and moisture threaten to destroy the Mohenjo-Daro excavation in Pakistan, the site of an ancient civilization that flourished at the same time as the civilizations in the Nile Delta and the river valleys of the Tigris and Euphrates.

• Athat flourished at the same time as the civilizations  
• Bthat had flourished at the same time as had the civilizations  
• Cthat flourished at the same time those had  
• Dflourishing at the same time as those did  
• Eflourishing at the same time as those were