An Example of a Problem-Based Investigation Is

An example of a problem-based investigation is:

A) determining how much money is necessary to make change for a purchase of $4.78 when $5 is given to the clerk at the store.
B) determining the base of a parallelogram whose area is 20 square units.
C) discovering various details (destination, speed, weight, cargo, etc.) about a train that passes outside a classroom window.
D) calculating how much time it takes for music class to finish if the time now is 2:15 and the class gets over at 2:43.