Question

A conclusion that can be drawn about the Allied invasion of Normandy in 1944 is that
it was a short but difficult series of battles.
it was a short but easy series of battles.
it was an endless series of easy battles.
it was an endless series of difficult battles.

Answer 1

it was a short but difficult series of battles.

The Normandy campaign (D‑Day, June 6, 1944, through the breakout and capture of Normandy by late August 1944) lasted a few months and involved heavy fighting, strong German defenses, and significant Allied casualties.