The correct options are
A The brightest star in a Nakshatra is called a yogatara.
B The portion traversed by the moon in a day around the earth is called a nakshatra.
A nakshatra is made up of 13 degrees and 20 minutes. Nakshatra is defined by the portion covered by the moon around the earth in a day. A Nakshatra is known by its brightest star called the yogatara.