Answer:
b) Strong winds and storms often damaged the bridges.
d) Bridges sometimes fell after ice on the river rams their supports.
Step-by-step explanation:
Ice Bridge Crash in 1912-02-04
By noon, 35 people were on the "ice bridge" spanning the Niagara River below the Falls. This wide, dense ice bridge allowed travelers to cross the Niagara River from Canada to the United States without having to use the international bridges downstream. A tremor abruptly hit the bridge. A thunderous groan at the foot of the falls rendered the distant roar faint. The grinding noises caused the ice bridge to heave and fall apart. Some lives were tragically lost after the Ice fell and rammed into the supports of the bridge.