The correct answer is option 1 - Pucca bricks. The people of the Indus Valley Civilization typically constructed their houses using pucca bricks. These bricks were made from a mixture of mud and clay, which was then baked in kilns to create solid, durable bricks. The use of pucca bricks was a significant architectural advancement for the time. It allowed for the construction of standard-sized, well-built houses with proper foundations. This construction technique also contributed to the urban planning of the Indus Valley cities, as the use of uniform bricks facilitated the building of well-organized, grid-like street systems. Therefore, while stone and wood may have been used for certain structures, such as temples and palaces, the predominant material for residential houses in the Indus Valley Civilization was pucca bricks.