Fill in the blank with the correct alternative :

The police were called _____ without delay by the residents.

in

The correct answer is Option (1) → in

Here's why:

• in: This preposition indicates "immediately" or "promptly" in this context, which aligns with the meaning of "without delay."
• out: This preposition doesn't have a relevant meaning in this context.
• for: This preposition typically suggests a purpose or beneficiary, neither of which are appropriate options here.
• off: While "off" can sometimes mean "immediately" when used informally, it's not the best choice in this formal context.