A photovoltaic element uses 90 cal of internal store energy to adjust its orientation over a 24-hour cycle. In average, the element captures 35% of the 1.0 W energy received from sunlight. Knowing that the efficiency of converting from solar to internal energy is 25%, determine how long does it takes to accumulate the energy needed to adjust its orientation? Select one: O a. 1.20 hours O b. 1.35 hours O c. 2.78 hours O d. 2.90 hours