Homo erectus had a large brain around.. (in $CC$)

The chronological order of human evolution from early to recent stages is:

The prehistoric human who lived on Earth during the late Pleistocene epoch is -

$A$: The brain reaches between $75$ and $80$ percent of its adult size within the first two years,and its full size at the age of $6$ years.
$R$: From an evolutionary point of view,the human gestation period is believed to be shortening.

Which of the following had the smallest brain capacity?

Which continent is known for having the largest number of human fossils discovered?