Sentence Correction

[BTGmoderatorRO]

At first in history, millions of people have virtual instant access from their
homes and offices to the creative output of a significant - and growing -
fraction of the planet's population.
(A) At first in history, millions of people have virtual instant access from
their homes and offices to
(B) For the first time in history, millions of people have virtual instant access
from their homes and offices for
(C) At the first of history, millions of people have virtual instant access from
their homes and offices in
(D) For the first of history, millions of people have virtually instant access
from their homes to
(E) For the first time in history, millions of people have virtually instant
access from their homes to

OA is E
I need a proper explanation on the use of 'At' and 'For'. Can an expert do justice pls.