What was the cranial capacity of Java Man (in $cc$)?

The evolution of man was possible because our ape-like ancestors possessed:

Which of the following is the closest relative of humans?

According to the fossils discovered so far,in which continent did human origin and evolution begin?

About $P$ million years ago,human-like primates walked in eastern Africa. They were probably not taller than $Q$ feet.
$Q$ 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.