What is the best definition of remote sensing?
a. analyzing data by using computer software
b. collecting data without physical contact with the object being observed
c. using technological equipment to gather about the world
d. gathering without the of a human being?

The best definition is B. collecting data without physical contact with the object being observed. 

Remote sensing is actually an entire science. It happens at a great distance. For example, that's how satellites collect the information about the Earth or some other planet. They analyze energy levels and patterns.