Final answer:
The (option A) communications industry is pivotal in providing jobs and boosting the economy through product sales and advertising, contributing significantly to the GDP.
Step-by-step explanation:
The question seeks to identify which industry both provides jobs and boosts the economy through product sales and advertising. It's evident that the service sector, encompassing industries such as healthcare, education, and communication, contributes significantly to the gross domestic product (GDP) and provides numerous jobs. The communications industry, which includes services like postage, telephone services, computer software, and accessories, is particularly influential. It not only offers a wide variety of employment opportunities but also plays a pivotal role in the economy by facilitating the exchange of information, enhancing productivity, and engaging in extensive advertising and product sales practices.