<prompt> A child is able to say sentence of 6 words at:2 years3 years4 years5 years  <response>: d. 5 yearsRef: Nelsons 20e p 65-77, Ghai 8e p 52-53Mnemonic:Between ages of 2 and 5 years, number of words in a typical sentence equals the childs age e.g. 2 by age 2 year, 3 by age 3 yearSo, a child speaks 5 word sentences at 5 years; So, out of the given options 5 years is the best answer. 