In the following question, a grammatically correct and meaningful sentence is given which is divided into four parts namely (A),(B),(C) and (D). Arrange these four parts to make a contextually and grammatically meaningful sentence.

(A) Jaigarh fort was built by
(B) and was named after him
(C) Sawai Jai Singh to protect the
(D) Amer Fort and its palace complex

Correct option is D

The correct rearrangement is D: ACDB.

Sentence Reconstruction

To find the logical flow, we follow the history and purpose of the structure:

1. (A) Jaigarh fort was built by: This introduces the subject ("Jaigarh fort") and the action. The preposition "by" requires the name of a person to follow.
2. (C) Sawai Jai Singh to protect the: This identifies the builder ("Sawai Jai Singh") and the specific purpose of the construction.
3. (D) Amer Fort and its palace complex: This completes the thought by specifying exactly what was being protected.
4. (B) and was named after him: This provides a final piece of information about the fort's namesake (Jai Singh).

The Reconstructed Sentence

"Jaigarh fort was built by Sawai Jai Singh to protect the Amer Fort and its palace complex and was named after him."