Answer:
b. Vega
Explanation:
Vega would be the star that is closest to the zenith on the summer star map. Vega is the brightest star in the constellation of Lyra. Its age is about a tenth of the sun. However, as the expected lifetime of the star is also a tenth of that of the sun (due to its larger size), both stars are at a similar point in their life expectancies. Vega is one of the most studied stars, as it is one of the closest stars to Earth and thus one of the brightest. Vega was also the Northern pole star around 12,000 BCE.