Based on your knowledge of word parts, which sentence uses the word introspection correctly?

a. because of his experience as a firefighter, matthew provided a unique introspection.
b. gillian stood up straight and braced herself for her mother's introspection of her outfit.
c. samuel waited patiently for the contractors to come and perform the building introspection.
d. after some soul-searching and introspection, peter knew that it was time for him to move on.