Final answer:
The incorrect reason for making gravel by hand in India is due to export restrictions on technology. The real reasons include cost-efficiency, higher employment opportunities, and lack of infrastructure for heavy machinery.
Step-by-step explanation:
The reason that someone in India may make gravel by hand instead of using machinery is not because of export restrictions on such technology by the countries who possess those machines. In countries like India, making gravel by hand can be cheaper because it requires minimal investment compared to costly machinery. Additionally, manual labor provides employment for more people in a region where job opportunities may be scarce. Moreover, the infrastructure required to operate and maintain large equipment may be lacking, which includes quality roads, bridges, electrical power, and internet. While some individuals may not be capable of operating large equipment, it is unlikely that this is a widespread issue given the right training and educational opportunities.