Column-I	Column-II
(A) Jawaharlal Nehru laid the foundation stone of the National Museum in	(D) through volcanic activity are potentially rich in cobalt.
(B) The feeling a person develops by practising devotion is unique	(E) Sobha Singh who built many of Lutyens’ buildings before independence.
(C) Scientists believe that underwater mountains formed	(F) a job we most cherish, and bhakti is an excellent activity.

The correct answer is C-D.

To determine the correct match, we need to combine the sentence fragments from Column-I with those in Column-II to form grammatically correct and meaningful sentences:

1. Let us analyze fragment (A): "Jawaharlal Nehru laid the foundation stone of the National Museum in". This requires a completion indicating a year or place (e.g., "1955" or "New Delhi"). None of the fragments in Column-II ((D), (E), or (F)) provide a grammatically logical continuation for this sentence.
2. Let us analyze fragment (B): "The feeling a person develops by practising devotion is unique". Combining this with fragment (F) gives: "The feeling a person develops by practising devotion is unique a job we most cherish, and bhakti is an excellent activity." This is grammatically incorrect and does not make coherent sense.
3. Let us analyze fragment (C): "Scientists believe that underwater mountains formed". Combining this with fragment (D) gives: "Scientists believe that underwater mountains formed through volcanic activity are potentially rich in cobalt." This sentence is grammatically correct and scientifically coherent, making C-D a valid match.

Therefore, the correct matching option is C-D.