प्राचीन प्रागैतिहासिक स्थल 'चौंतरा' निम्नलिखित में से किस नदी के किनारे स्थित है?

Gautama Buddha was born at ______.

Consider the following statements regarding a historical period: (i) Animals began to be used for transporting goods during this period. (ii) Trade and transportation developed significantly in this era. (iii) Pottery making using the potter's wheel started in this age. Which historical period is described by the above statements?