The answer to this question is b
Answer:

Plasmodesmata play roles in both cellular communication and in molecule translocation. Plant cells must work together as part of a multicellular organism (the plant); in other words, the individual cells must work to benefit the common good. Therefore, communication between cells is crucial for plant survival.
The correct answer is B, because scientist can do a tally to see what kinds of backpacks are bought the most (aka the most popular). All of the other answers are a matter of opinion.