If a Professional Scientist Is Trying to Build an Extensive

Multiple Choice

If a professional scientist is trying to build an extensive database of bacterial swabs from humans in all parts of the world,what is the most cost-effective way to increase the number of samples collected in a one-year time period?

A) Train citizens to collect samples from the public.
B) Hire more researchers to travel around the world.
C) Send a single professional scientist to locations throughout the world.
D) Pay for citizens around the world to travel to a central laboratory where samples will be collected.