Where were the fossils of $Homo$ $erectus$ discovered?

Which of the following has the lowest cranial capacity?

The cranial capacity of modern man 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.

Assertion: The earliest fossil form in the phylogeny of horse is $Eohippus$.
Reason: $Eohippus$ lived during the early $Pliocene$ epoch.

The cranial capacity of Cro-Magnon man was approximately: (in $, c.c.$)