Which of the following was not a reason for the decline of the roman empire?

a declining economy
increase in loyalty from mercenaries
weak roman government
lack of food

Increase in loyalty from mercenaries was not a reason why the Roman empire suffered a decline.

The Roman empire was glorious at its peak but saw itself steadily crumble. This was the result of a mix of factors such as:

Rome had to hire mercenaries as its armies decreased but these mercenaries could not often be trusted as they took Roman land.

In conclusion, loyalty from mercenaries was lacking and so an increase in it could not have been a reason for the decline of Rome.

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Explanation:

Invasions by Barbarian tribes. The most straightforward theory for Western Rome's collapse pins the fall on a string of military losses sustained against outside forces. Rome had tangled with Germanic tribes for centuries, but by the 300s “barbarian” groups like the Goths had encroached beyond the Empire's borders.