Industry projections are that how many people worldwide will use healthcare apps on smartphones?

• A. 1 billion
• B. 100 million
• C. 500 million
• D. 50 million

Answer: (C)

The main idea here is the expected scale of global adoption for healthcare apps on smartphones. Industry projections place the number in the hundreds of millions, reflecting how quickly smartphones are used for health tasks like appointment reminders, symptom tracking, telehealth, and wellness management. A projection around 500 million fits as a balanced estimate: it’s clearly substantial and consistent with broad smartphone penetration and growing app ecosystems, without assuming every smartphone user worldwide will adopt health apps.

Choosing a lower figure underestimates the momentum in mobile health, while jumping to a number near or at one billion seems overly optimistic given variations in access, age groups, and regional adoption. So, 500 million is the best-fit projection among the options.