Concept:Sentence rearrangement requires identifying the logical sequence of parts to form a coherent sentence.
Explanation:Part D introduces the main topic: India's geological processes starting 75 million years ago.
Part A follows D, describing the Indian Plate as part of Gondwana at that time.
Part C continues by stating that the plate began a north-eastward drift due to seafloor spreading.
Part B concludes by giving the directions of the drift: to its south-west, then south and south-east.
Thus the correct sequence is D, A, C, B.
Answer:Option C: DACB