Step 1: Understanding the Concept:
J. Paul Leagans' (1961) extension communication model establishes a six-element linear communication fidelity process.
Key Formula or Approach:
\[ \text{Communicator} \longrightarrow \text{Message} \longrightarrow \text{Treatment} \longrightarrow \text{Channel} \longrightarrow \text{Audience} \longrightarrow \text{Audience Response} \]
Step 2: Detailed Explanation:
In J. Paul Leagans' classical Model of Communication Process (1961):
The systematic sequential transmission elements are:
1. Communicator (B): The person who starts the process.
2. Message (A): The information/content to be communicated.
3. Treatment of the Message (C): The way message is structured and designed for clear presentation.
4. Channel of Communication (D): The physical transmission medium audio-visual aid.
5. Audience + Audience Response (E): The intended receiver and their resultant behavioral response/feedback.
Correct sequence: B $\rightarrow$ A $\rightarrow$ C $\rightarrow$ D $\rightarrow$ E.
Step 3: Final Answer:
Therefore, the sequence of elements as per the Leagans model is B, A, C, D, E, matching option (D).