Andrew is no smarter than his graduate school classmates, but his self-discipline and passionate dedication to long workdays resulted in notably superior academic accomplishments. andrew's unusual level of success best illustrates the importance of
a. analytical intelligence.
b. street smarts.
c. the g factor.
d. grit.

D. grit

Explanation:

Grit refers to our ability to persevere for a long time due to the passion we have towards achieving a particular goal that means much to us.

This means being resilient and continuing to follow your dream even when there are stumbling blocks along the way.

This is driven by knowing where you want to go and constantly following that path no matter what with intense committment. This means you are able to endure even the most difficult situation even when you fail but still you keep pushing and moving forward.

a factory opens that mass-produces light bulbs.

explanation:

not sure if that's an answer to your questions but this is an example! : )