The star Algol in the constellation Perseus has the following unusual characteristics.Every 68.75 hours its brightness dims suddenly from apparent magnitude 2.3 to apparent magnitude 3.5 and remains there for a few hours before returning just as suddenly to 2.3.In addition,halfway through this 68.75 hour period,the apparent magnitude becomes slightly dimmer than 2.3 for a few hours and then returns to 2.3.From this information alone it is possible to classify Algol as a(n) :
A) optical double.
B) eclipsing binary.
C) totally eclipsing binary.
D) partially eclipsing binary.
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