Answer :
The following are the factors, chosen from the options provided, which increased tensions in Europe on the verge of World War I:
- Massive armed armies were erected by nations to safeguard their interests.
- In the event of an assault, nations promised to defend one another.
- Building global empires was a competition between nations.
- Countries promoted fervent attachment to one's country.
- Countries were vying for supremacy as the leading powers during the time before World War I officially started.
- While Germany and Russia stood in opposition to each other, nations like the United States and Great Britain stood together.
- Young men from several nations were inspired to work hard by their respective national leaders in order.
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