Answer: The correct answer is- D. Storing and sharing collective knowledge.
Human language is a medium/ mode of communication among people so as to exchange their information, ideas, knowledge, and thoughts.
There can be several vital functions of human language such as -
Informational ( used to share knowledge).
Expressive ( used to express feelings and attitude).
Directive (used to influence the behavior of other person such as requesting, commanding).
Aesthetic ( to value the beauty of an object).
Phatic ( used for sociability).
As per the information in the question, Susan is sharing knowledge with Jacob by telling the location of flour jar. Therefore, in this situation, storing and sharing collective knowledge is being expressed.