The central idea of this article is that bicycles were and still are important military device. how does paragraph 2 support the central idea.

a. it explains that the first military bicycles were sturdy because they were made of iron and weighed 100 pounds

b. it explains that army regiments have been fighting on foot since ancient times.

c. it explains that the 25th infantry was a regiment of african-american soldiers.

d. it explains that bicycles were important to a regiment of african-american soldiers in the 1890s.