(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

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.

The correct option is ACDB.

To arrange the sentence fragments into a grammatically correct and meaningful sentence, let us analyze each part and their logical sequence:

1. Part (A) "Jaigarh fort was built by" introduces the main subject ("Jaigarh fort") and the action ("was built by"). This naturally requires a subject/person who built it to follow.

2. Part (C) "Sawai Jai Singh to protect the" directly identifies the builder ("Sawai Jai Singh") completing the phrase "built by Sawai Jai Singh", and states the purpose ("to protect the").

3. Part (D) "Amer Fort and its palace complex" specifies what was protected by Sawai Jai Singh ("Amer Fort and its palace complex").

4. Part (B) "and was named after him" provides additional historical context about Jaigarh fort being named after Sawai Jai Singh, concluding the sentence smoothly.

Putting these parts together in the order of A → C → D → B gives:

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

This sentence is coherent, grammatically sound, and contextually complete. Hence, the correct sequence is ACDB.