A. Because they made the Israelites planters of gardens, orchards, and trees, the hail destroyed all the plantings (Shemot Rabbah Parasha 12, Siman 5).

B. Because they stoned the Israelites with stones, they were stoned by the hail (Tanchuma Bo Siman 4).

C. Because Pharaoh did not want to listen to the voice of Hashem, Hashem made His voice heard through the hail against Pharaoh's will (Kli Yakar Shemot 7:17).

D. Because they forced the Israelites to sleep in the field with the animals, they were forced to bring their animals into their homes to sleep with them (Kohelet Yitzchak Shemot 19:9).