Anormally functioning 65-year-old who cannot solve abstract logic puzzles are as quickly as he did when he was younger is experiencing aa. phenomenon that is uncommon for people his ageb. phenomenon predicted by erik erikson as part of the eight stages of psychosocial developmentc. decrease in his crystallized intelligenced. decrease in his fluid intelligence

The 65 year old person is experiencing:

d. Decrease in his fluid intelligence

Explanation:

Fluid intelligence is a typye of intelligence that refers to the hability to reason, analyze and solve problemes. This type of intelligence normally decreses within the years, this is why it affects elderly people. To solve a puzzle a person needs to use logic and pattern recognition, which are the functions of this type of inteligence.

Fluid intelligence requires physiologycal functioning, this is why old people do not have the same functioning as young people.

answer; overt behavior;