The poorest areas of rio de janeiro, which often pool yearly resources to design lavish costumes and floats for carnival, are known as

The correct answer to the following question will be "Favellas".

Explanation:

Favela, also known as favella, in Brazil, a shantytown situated within and even on the edges of the major cities of the world, in particular, Sao Paulo and Rio de Janeiro.It typically comes across as if squatters invade unused land onto the edge of the city and build huts with reclaimed or looted goods.

Therefore, Fevallas is the right answer.