What Can Be Said About the Phylogeny of the Early

What can be said about the phylogeny of the early hominins?

A) The absence of an agreed upon phylogeny of hominins makes it impossible to understand early hominin evolution.
B) Only recently have we developed a secure and agreed upon phylogeny of early hominins.
C) We do not have a secure, agreed upon phylogeny for early hominins, but we can still understand the general patterns of early hominin evolution.
D) The most obvious pattern indicated by early hominin evolution is the early increase in brain size and slowing down of maturation rates.