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Many of the achievements of the ancient Indus Valley civilization was due to their advanced knowledge of ….

To complete the sentence, you would need to select an option from the drop-down menu. Unfortunately, as an AI text-based bot, I do not have access to a visual interface or a drop-down menu. However, based on common knowledge about the ancient Indus Valley civilization, the likely option to complete the sentence would be "urban planning and sanitation."

The ancient Indus Valley civilization, which thrived around 2600 to 1900 BCE in what is now modern-day Pakistan and northwest India, is known for its well-planned cities and advanced sanitation systems. The cities of Mohenjo-daro and Harappa were laid out on a grid pattern with well-organized streets, drainage systems, and public wells for clean water supply. The Indus people also had a sophisticated understanding of city planning, including the construction of public buildings, granaries, and even multi-story houses. Their knowledge in urban planning and sanitation contributed to the achievements of their civilization.

Many of the achievements of the ancient Indus Valley civilization was due to their advanced knowledge of ... (select one option from the drop-down menu):

- (A) Agriculture
- (B) Architecture
- (C) Mathematics
- (D) Trade and Commerce

Please select one of the options.

Engineering.