Final answer:
The statement by the student is false because it oversimplifies the physics involved in moving a box up a ramp by not considering factors such as friction and the incline's angle.
Step-by-step explanation:
The question seams to be a Physics problem, specifically revolving around the concept of work, energy, and force on an inclined plane.
When the student mentions a force of 100 N to push a 300 N box up a 1.0 m high and 3.0 m long ramp, they are simplifying the scenario considerably and not accounting for friction, angle of the ramp, and the actual calculation involving work done against gravity.
The true force required to push the box up the ramp is contingent upon these variables and cannot solely be determined by the height and length of the ramp without more complex calculations.
Therefore, the correct response to the statement provided: "He said that, because the ramp was 1.0 m high and 3.0 m long, he must have been pushing with force of exactly 100 N." is B) False.
This conclusion is based on the consideration that simply dividing the weight by the height of the ramp does not yield the actual force needed to push the box up unless the ramp has no friction and is considered to be an ideal machine, which is an uncommon scenario in real-world physics problems.