Interesting that they lay out 2 possibilities for the spread of agriculture: 1- From the fertile crescent to IVC 2- Independently evolved in IVC but not: 3-

Interesting that they lay out 2 possibilities for the spread of agriculture: 1- From the fertile crescent to IVC 2- Independently evolved in IVC but not: 3- IVC to fertile crescent Since there were IVC related individuals who were buried in Iran and Turkmenistan, why is #3 not an option?