Question

Choose the grammatically correct sentence.

• A. You should at once report it to the concerned authority.
• B. You should report it at once, to the authority concerned.
• C. You should report it at once, to the concerned authority.
• D. You should at once report it to the authority concerned.

Hint:

Recall that "concerned" meaning "relevant" goes after the noun, as in "authority concerned", not before it.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
This question checks two grammar points together: where to place the adverb "at once" in a sentence, and how to correctly use the word "concerned" when it means "the one in question" rather than "worried".

Step 2: Key Formula or Approach:
When "concerned" means "relevant to the matter" or "in question", it is placed after the noun it describes, as in "the person concerned" or "the authority concerned". Placed before the noun, "concerned" instead means "worried", which changes the meaning. Adverbs like "at once" also read most naturally when placed close to the verb they modify.

Step 3: Detailed Explanation:
Option (A) gets "at once" right but says "concerned authority", which wrongly implies a worried authority instead of the relevant one.
Option (B) gets "authority concerned" right but adds a comma that breaks the sentence into two unnatural parts.
Option (C) repeats both mistakes, the wrong "concerned authority" order and the unneeded comma.
Option (D) places "at once" naturally right after "should" and correctly uses "the authority concerned" to mean the relevant authority.

Step 4: Final Answer:
Option (D), "You should at once report it to the authority concerned," follows both rules correctly and reads smoothly. \[ \boxed{\text{Option (D)}} \]