Ahistorian looks through hundreds of photographs from the terrorist attacks on new york city's world trade center on september 11,2001, try to learn more
about the people it affected. which skills would the historian be using? would it be primary source analysis ?

That would be primary source analysis because he's going through photographs FROM September 11, 2001 - the source directly points it out.

It could be anything, recent improvements in technology/telecommunication/internet have increased the pace of globalization.generally, it has something to do with technology. globalization means that people around the world are brought together through technology which speeds things up. so maybe some of those options could be correct. : )