It is given that "These graceful molluscs moved backwards by means of their locomotive tube, through which they propelled the water already drawn in. Of their eight tentacles, six were elongated, and stretched out floating on the water, whilst the other two, rolled up flat, were spread to the wing like a light sail." Hence, we can say that (1- ii) is a correct combination.   Sharks and snouts are linked in seventh para. Coral formation with cocos is mentioned in the 4th paragraph.   Insufia being colorless is stated in eleventh para. Hence, option A is the correct answer.