Teresa, the owner of Plant Fantasies, communicates the landscape design requirements to her employees in the flower department multiple times. This is an example of:.
a. upward communication.
b. downward communication.
c. horizontal communication.
d. Informal communication.

The answer is downward communication (Option B)

Explanation:

Downward communication is said to have taken place when information is relayed from superiors to subordinates. In other words, it is the kind of information that flows from people at the top of an organization structure (superior) to those at the bottom (subordinates).  

Teresa (in the question) belongs to the top of her business or company (Plant Fantasies). She carried out downward communication by informing her employees (subordinates) in the flower department about landscape design requirements.

Downward communication could be oral or written. The oral takes the form of meetings, speeches and telephonic conversations e.t.c. On the other hand, the written takes the form of electronic displays, manuals, handbook, manuals, notices e.t.c.