Final answer:
Without specific context, it's difficult to determine the exact effect of Frederick's death on his army, but historically, the death of a key leader often leads to disorganization and morale decline, suggesting dissolution as a likely outcome. The correct option is D.
Step-by-step explanation:
The question 'What effect did Frederick's death have on his army?' seems to be inquiring about a specific historical figure and event. Without the proper context, it's challenging to provide an accurate answer.
This could pertain to several historical figures known as Frederick, such as Frederick the Great of Prussia.
Assuming the context is related to a prominent figure such as Frederick the Great, his death would have likely caused dissolution or demoralization of his army rather than an uplifted morale, inspired revenge, or prompted retreat.
Historical accounts often show that the death of a significant leader can lead to disorganization and a decline in morale, making dissolution a likely outcome.
For example, during the American Revolution, the winter at Valley Forge was a severe low point for George Washington's troops, where desertions were high due to poor morale and conditions. The correct option is D.