Select the most appropriate option to fill in the blank.
The Allies ______ the war in 1945.

Correct option is C

The correct option to fill in the blank is (c) won.
'won' is the past tense of 'win,' fitting the historical context of the Allies winning the war in 1945.
Meanings of other options:
• have won: present perfect tense.
• were winning: past continuous tense.
• win: present tense.