Final answer:
The advantage not included in personal selling is the ability to reach a large number of customers simultaneously, making option A the correct answer.
Step-by-step explanation:
The advantage not inherent in the use of personal selling as the primary marketing communications tool is A. The large number of customers that can be reached. Personal selling is highly effective for its ability to convey extensive information, facilitate two-way communication, and tailor messages to the specific needs and interests of customers.
However, it is not characterized by the ability to reach a large audience simultaneously; instead, it is a more personalized approach that typically involves one-on-one interactions or small group presentations. In contrast to mass marketing strategies which aim to reach a wide audience through media such as advertising, personal selling focuses more on individual customer relationships and often involves a longer sales cycle.
Mentioning the correct option in the final answer, it is evident that personal selling cannot reach as many customers as broadcast methods, such as television or digital advertising, making Option A the correct answer to the question about which factor is not a benefit of personal selling.