ongs and singing are very popular at Christmas time in Puerto Rico. People like to go carol singing, known as Parrandas (also sometimes called Asalto or Trulla). Friends gather late in the evening (about 10pm) and visit different houses. People are meant to be surprised and woken up by the music and singing of the 'parranderos' (those taking part in the 'parranda'), although most people have 'arranged' that they will be visited; because the custom is that when you've been 'woken up' you have to join in the parranda so it grows during the evening as more party go-ers join in! The fun can last all night, finishing at dawn!
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Puerto Rican homes are decorated with greenery, often with branches from palm trees as well as Christmas decorations similar to those in the USA like Christmas Trees (normally artificial). Nativity Scenes 'nacimientos' or 'pesebres' are also popular. The figures of the Three Kings are very important. People also like to wear a traditional straw hat called a 'pava' at Christmas celebrations.
Both C and D are items; vacuum cleaners, and tasks. If you're talking about your brother and you, tasks would make more sense, but either one could grammatically be correct.
