What is the chief reason people choose the foods they eat? 1) cost 2) taste 3) convenience 4) nutritional value?

The correct option is TASTE.
Most people eat the food they eat because of the taste of the food.Other factors play a role in choice of foods, but taste is the principal reason on which people based their choice of food. The different tastes that people exhibit for food is due to the fact that different people have different taste buds that behave differently.

This is the most closely resembles the model. 

Atissue is a group of connected cells that have a similar function within an organism.