Jane's first child was born a month ago, and like many other new mothers, she often exclaims that she had no idea that an infant could be so much work. Which of the following is true?

a. Jane's concept of an infant is not currently modifiable.
b. Jane can no longer think about an infant abstractly.
c. Jane is applying the language relativity hypothesis.
d. Jane's concept of an infant has been modified.

D