What years was mohenjodaro an active settlement

2550 B.C.E, while the Great Pyramid was being built in Egypt

It was in 1834 that's the answer I got from Google

The correct answer is a. when they started making tools that will them in cultivating lands, they could raise crops and that made them attached to one place for a longer period of time. after that, they started domesticating animals and building their own permanent settlements that resemble the ones we have today.