The invasion force had no artillery and was completely annihilated.

The correct answer is B. destroyed.

The word "annihilated" means to destroy completely. The other options do not mean to destroy completely.

• Reduced means to make something smaller or less in amount or degree.
• Dismembered means to cut off the limbs or head of a person or animal.
• Split means to divide something into two or more parts.

In the context of the question, the invasion force was completely destroyed. This means that they were killed or captured, and their equipment was destroyed.