Preoperational children typically believe that others see the world, both literally and figuratively, exactly as they do, a concept known as egocentrism

According to research on the tip-of-the-tongue phenomenon,

a. when an item is on the tip of your tongue, you will seldom be able to recover it. b. your mental dictionary is arranged in alphabetical order. c. you can identify similar-sounding words, but you cannot accurately guess the number of syllables in the target word. d. you can typically provide a similar-sounding word, which matches the target word reasonably closely.

Today, most of the frail elderly are cared for by ______

Fill in the blank with correct word