Sunspots are dark because   a. regions of the photosphere are obscured by material in the chromosphere.   b. shock waves move through the photosphere.   c. the sun rotates differentially.   d. the strong magnetic field inhibits the currents of hot gas rising from below.   e. they radiate their energy into space faster than the rest of the photosphere.

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A: Option b i.e. in 8 minutes is the correct answer.

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A: The correct answer is option d i.e. strength of the magnetic field. 

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