The key to control over the Eurasian steppes lay in the nomad’s ability to use the horse both as a means of transport

[BTGmoderatorDC]

The key to control over the Eurasian steppes lay in the nomad’s ability to use the horse both as a means of transport but also as an effective military tool.

(A) but also as
(B) or as
(C) and as
(D) or
(E) and also


OA C

Source: GMAT Prep