The connection between sleep deprivation and lapses in memory, impaired reaction time and poor concentration is well (29) ___________.

Test knowledge: The right choice of words/ Compound adjectives

One of the ways to form compound adjectives is to apply the formula “Adverb + P2”, in this case, the adverb is well.

The options are explained as follows:

A. (well) arranged (adj): well arranged.

B. (well) organized (adj): well organized

C. (well) established (adj): to stand firm, to last for a long time

D. (well) acquired (adj): well absorbed (talking about knowledge, skills)

When combined with the subject “The connection”, option C is the most suitable.

Sentence meaning : The link between sleep deprivation, memory loss, slow reaction levels, and poor concentration has been known for a long time.