Find the best word to complete the sentence.

As the oldest plants on earth, ferns are ___ survivors in domestic gardens.

a. primordial

b. preposterous

c. pretentious

d. premonition

The correct answer is A, primordial, because that is the only one which fits.

'Preposterous' means 'absurd'. 'Pretentious' means 'expressing exaggerated importance, worth, or stature'. 'Premonition' means 'forewarning'.

So, the correct answer is A, which means - existing from the beginning of time, very ancient.