Which Estimates the Number of Electrons Per Cubic Centimeter Excited

Which estimates the number of electrons per cubic centimeter excited to the conduction band as a function of temperature and the band gap energy.
-Refer to Exhibit 22-2. The band gap of pure crystalline silicon is 1.94´10^-19 J at 300 K. How many electrons are excited from the valence band to the conduction band at this temperature in a 1.00 cm³ silicon crystal?

A) 1.70´10⁹
B) 4.80´10¹⁵
C) 0.555 N_A
D) 1.46´10⁷