How did Mesopotamian culture improve travel? a. It invented the caravan.
b. It invented the wheel.
c. It invented the engine.
d. It invented the. steamboat.

Explanation:

Nawalparasi District (Nepali: नवलपरासी जिल्ला, pronounced [nʌwʌlpʌˈɾasi] (About this soundlisten)) part of which belongs to Gandaki Pradesh and part to Lumbini Province, was one of the seventy-five districts of Nepal before being divided. The district, with Ramgram as its district headquarters, covered an area of 2,162 square kilometres (835 sq mi) and has a population (2011) of 643,508.

This district has given birth to many Nepal's top-level people, including the late Prime Minister Tanka Prasad Acharya. The midpoint of Nepal's east–west highway Mahendra Highway lies in this district. The Nawalpur valley is the part of greater Chitwan Valley of inner terai where most of the populations are Tharu, Magar and Brahmins who settled migrating from the hills. The big industries such as Chaudhary Udhyog Gram (CUG), Bhrikuti Pulp and Paper factory[1] are located in the nawalpur area of this district. Since Parasi is the headquarter of Nawalparasi district many of the clerical offices are located there. Nepal's one of the biggest Sugar factory, Lumbini Sugar Industry, which was made by China's support, also lies in Sunwal Municipality of this district. Nowadays many industries are also being operated here like Sarbottam Cement factory, Butwal cement factory, Triveni distillery, cement factory of CG in Dumkibas, Jamuwad paper factory and other cottage industries. Developing cities such as Devchuli Municipality, Gaindakot Municipality, Kawasoti Municipality Sunwal Municipality, Madhyabindu Municipality and Bardaghat Municipality are located here. Famous towns in Nawalpur Ragion are Gaindakot, Rajahar, Keurani, Pragatinagar, Kawasoti, Shahid nagar Danda, Chormara, Arungkhola etc. Half of the Nawalpur Region is mainly hilly areas mainly populated by Brahmins, Magar and Chhetri people and terai area is mainly populated by Tharu people.

Nawalparasi district is connected to Rupandehi District on the west, Palpa and Tanahun Districts on the north, Chitwan District on the east and south and the Indian border. The longest road of Mahendra highway, 99 km in length, lies in this district. Major cities of Nepal such as Butwal, Siddharthanagar, Tansen and Bharatpur metropolitan municipality are located in neighbouring districts