The first location to receive smell information in the brain is the

Olfactory bulb is the first location to receive smell information in the brain

It is  occipital cortex. It is a region between our brain and eyes. It is the most active region so it has the advantage to hear, see and smell faster than any organ in this body. HOPED THIS HELPS YOU :)

To establish causation sociology, there are three key factors namely correlation, time order and ruling out alternative explanations.  correlation  gives the difference between the alternatives to be considered, time order gives the occurrence of events chronologically, finally, the ruling out alternative explanation gives one the chance to get the best alternative