Which statement is an opinion?

a. acanthaster planci, also known as the crown-of-thorns starfish, is a carnivorous starfish that preys on coral.

b. in the reefs off the north coast of jamaica, one can find a species of monatrea annularis, which is flat to capture light efficiently.

c. stony coral is one example of the hexacoral polyps and has tentacles in groups of six.

d. people must take action now to protect coral reefs by reducing pollution and emissions of noxious gases.

the answer is d. she became an english professor at university of georgia.

it was surely an odd creature that one made up by reading the historians first and the poets afterwards a worm winged like an eagle; the spirit of life and elegance and charm,   in a kitchen chopping up suet. but these creatures, monst'r however entertaining to the imagination, hast no existence in fact. what one might doth to bringeth h'r to life wast to bethink poetically and prosaically at one and the same moment,   thus keeping in toucheth with fact—that the lady is mrs martin, ag'd thirty-six, did dress in blue, wearing a black coxcomb and brown shoeth; but not losing sight of fiction eith'r—that the lady is a vessel in which all s'rts of spirits and f'rces art coursing and flashing p'rpetually. the moment, howev'r, yond one tries this method with the elizabethan mistress, one brancheth of illumination fails; one is did hold up by the scarcity of facts.   one knoweth nothing detailed, nothing p'rfectly true and substantial about h'r.   hist'ry scarcely mentions h'r.   and i did turn to professeth'r trevelyan again to seeth what hist'ry meanteth to that gent.   i hath found by looking at his chapt'r headings yond t meanteth.