a) remembered I have a tumblr accountb) looked at past tumblr postsc) remembered that we actually saw the statue from the front of the guidebook that has long since gone back to the libraryd) picture post 

a) remembered I have a tumblr account
b) looked at past tumblr posts
c) remembered that we actually saw the statue from the front of the guidebook that has long since gone back to the library
d) picture post