First of all, you need to know what the sentence above means. "In general, to enter a car and unlock it, you need ___." The options are llaves (keys), antenas (antennas), espejos (mirrors), and tanques (tanks). So obviously, based on the context, the correct answer is going to be llaves.
Another important day, is La Candelaria 'the Candles' or Virgen de la Candelaria 'Virgin of Lights or Candles' (this is also known as Candlemas in other countries around the world) on the 2nd February and it marks the end of the Mexican Christmas celebrations.
