What is the most obvious flaw in the following explanation? Ernie has very white teeth because he practices good dental hygiene.

A) It lacks strength.
B) It is incomplete.
C) It is uninformative.
D) It is implausible.
E) There is no obvious flaw.

When learning a new word, children apply it to other objects in the same category, a strategy known as ______.

A) logical extension
B) fast mapping
C) mutual exclusivity
D) telegraphic speech