1. What kind of waves are present during an earthquake?
2. What kind of energy does an unlit match have?
3. Which of these is another way to write Newton's second law of motion?
4. What is it called when the light changes direction after leaving a lens?
5. How do you calculate density?

The last option is correct.

Explanation:

An emission spectrum is that obtained by passing a white light, such as that of the Sun, or of the flame of another element (oxygen, in this case), by a prism and a discontinuous spectrum is obtained. Absorption is when the continuous spectrum passes through another gas and causes the presence of dark lines.

In the case of the options provided, most likely the oxygen emission spectrum is that shown in the last option. This is because, the light pattern, shown in this option is what most resembles the light pattern of the oxygen absorption spectrum.