Pop quiz on museum history

from strange behaviors (a blog about weird and surprising behaviors...and stories of how species get discovered):
What spurred the 19th-century “new museum” movement?

1.  Generous donations from American “robber baron” railroad magnates 
2.  The British urge to out-compete the museums of rival nations
3.  Dermestid beetles, which ruined many old museums
4.  Advances in taxidermy

And the answer is...