All Babies Throughout the World Do Which of the Following

All babies throughout the world do which of the following with regard to language development?

A) They go through the same sequence of language development at the same rate.
B) They go through the same sequence of language development but the rate may be different depending upon where the child grows up.
C) They go through different sequences of language development at the same rate.
D) They go through different sequences at different rates depending upon where the child grows up.