Which pattern emerged in horse evolution as scientists early horse fossils and modern horse bones?

A. Early and intermediate horses had three foot bones ( two small and one large), and modern horses have four foot bones ( three small and one large).
B. The earliest horses had a single large foot bone, intermediate forms had three four bones ( two small and one large), and modern horses have four foot bones ( three small and one large).
C. The earliest horses had four foot bones ( three small and one large ),intermediate forms had three four bones ( two small and one large), and modern horses have a single large foot bone
D. Early and intermediate horses had four foot bones (three small and one large), and modern horses have three foot bones ( two small and one large )

B. The earliest horses had a single large foot bone, intermediate forms had three four bones (two small and one large), and modern horses have four foot bones (three small and one large).