Question

Thompson's Plum Pudding model allowed scientists studying the atom to do which of the following:

Answer 1

Um... You're missing your choices.

Truth be told Thompson was a Cambridge professor with quite the ego, the type of person who typically insisted whatever he proposed was correct; and thus he surrounded himself with "yes men" (students wanting to impress him). His model of the atom is quiet crazily WRONG but at the time everybody was like ooooh aaaah!

In his model, there's a positively charged pudding "medium" filled with negative charges he still called "corpuscles" (because saying "electrons" would mean he couldn't credit himself) all mixed in an amorphous amoeba-like blob.

Here's Thompson's work on the subject, you'll know your answer most certainly if you read it:
http://www.chemteam.info/Chem-History/Thomson-Structure-Atom.html

Answer 2

*cricket chirping*