What does the "in thing" in the 2nd paragraph mean

A．No one is sure of the future.
B．Anything's possible.
C．There will be numerous internet companies.
D．The new new thing will bring good fortune to smart people.

A．He focuses on Internet while others go to big famous places of finance and politics.
B．He plays a lot while others take various jobs.
C．His summer work is more practical and independent than others'.
D．He works hard while others play a lot.