You can eliminate C right away, which leaves you with A, B, and D. Personally, I would choose B and D. When choosing paths in life, its often important to make tough decisions. And these choices sometimes are dependent on your future, making the answer B and D.
The answer to your question is reserved words. your welcome.
The electromagnetic wave is self propagating, what I mean by that is, an electric field generates a magnetic field at 90 degree phase angle, and the magnetic wave you get as a result generates the electric wave at the same phase angle. The interchange of electric to magnetic and vice versa continues and lets the electromagnetic waves to travel without any medium. Quite interesting, really!
The evidence leads to the conclusion.
The specific observations follow logically from the generalization.
The generalization follows logically from the specific observations.
Answer:
Has very little time to prepare?
Explanation: