The soldiers lay … the town to arrest the terrorists.

Analyze the question: This tests your knowledge of fixed phrases (collocations) with prepositions. The phrase is "lay siege ___ a place."

Explain the concept: The idiom "lay siege to" means to surround a place with armed forces in order to capture it or force those inside to surrender. The preposition that always follows "lay siege" is to.

• Correct: The army laid siege to the city.
• Also correct (different structure): The city was under siege. or The city was besieged by the army.

Step-by-step solution:

1. The sentence needs a verb phrase meaning "surround and attack": "lay siege."
2. The object of the siege (the town) must be introduced by the right preposition.
3. Checking the options: • A. "siege on": not idiomatic. • B. "siege to": the correct standard idiom. • C. "siege with": incorrect. • D. "siege by": "by" would be used to name who is doing the besieging (e.g., "The town was under siege by soldiers"), not to introduce the place.

So the sentence reads: The soldiers lay siege to the town to arrest the terrorists.

Answer: B. siege to

Tip: Memorize it as a package: "lay siege TO". Just as you "lay claim to" something, you "lay siege to" something. Both take "to."