Researchers now believe that most elderly people a) have average intellectual abilities.
b) have superior intellectual abilities.
c) close their intellectual abilities.
d) retain their intellectual abilities throughout life.

D: retain their intellectual abilities throughout life.

Explanation:

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abraham lincoln issued the preliminary emancipation proclamation on september 22nd, 1862. it stipulated that if the southern states did not cease their rebellion by january 1st, 1863, then proclamation would go into effect.