B

Step 1: Understand the types of spectra. A continuous emission spectrum shows all wavelengths in a certain range, while a line absorption spectrum shows specific wavelengths that are absorbed by elements in a cooler gas.
Step 2: Identify the source that can provide both spectra. The sun emits a continuous spectrum due to its hot photosphere.
Step 3: As the light from the sun passes through the cooler outer layers (the solar atmosphere), specific wavelengths are absorbed by elements in those layers, creating a line absorption spectrum, commonly known as Fraunhofer lines.
Conclusion: The sun is the only option that yields both a continuous emission spectrum and a line absorption spectrum simultaneously.
Therefore, the correct answer is B.