Options D and E are definitely wrong. Because they are changing the intended meaning of the Sentence. The Original sentence gives focus on the 'total number of transfers,i.e. almost $100 billion annually' through the main verb
'is' and also on the equivalence of those three countries’ foreign assistance budget...... So there should not be a shift in meaning. Choice D and E clearly shift the focus away from 'almost $100 billion annually', and hence breaks the intended meaning.
e-gmat always says the intended meaning must be preserved unless we find grammatical mistakes in all the choices that preserve the intended meaning.
In the above question, choices A and B seems to have been shuffled. ( see the exclusion of
'or' in option A)
Choice A also breaks the intended meaning by removing 'or' ...
Choice C incorrectly uses 'are' to describe 'The total number of transfers' .. Uses 'or' correctly and maintains the intended meaning.
'
The total number of transfers' -----> always singular........
'
A total of 10 transfers were made' ----> PLural
Hence B should be correct (which has 'is' and 'or' in it)....PLease note that choices A and B seem to be shuffled in the Question posted above.