Because mud was used in houses: ventilation was good thieves could enter easily
bricks were seldom used
houses collapsed easily

thieves could enter easily

Explanation:

Most poor people had a hole in the middle of the floor for a toilet. In London, garbage was thrown in the streets until the fourteenth century. Underground plumbing was poor until the 1200s. Open fires were used, and the smoke blackened the walls. Mud was used to fill in cracks in wooden houses. Thieves often entered by knocking out the mud. Dirt floors and thatched roofs were common. Homes were rough, indeed. Life was hard for the poor.

well i'm late but i think its: b, c, and e

abu bakr, was a senior companion and—through his daughter aisha—a father-in-law of the islamic prophet muhammad. abu bakr became the first openly declared muslim outside muhammad's family. abu bakr served as a trusted advisor to muhammad.