Usually, I post the explanation and then schedule it in the next few days to appear under a question. Generally within two days.

However, I will explain nonetheless. I am happy to do that

Best thing is always o read carefully the sentence an dtry to have a clear idea how and what the blank looks like

Breaking down the sentence

Though it seems to propagandize a communist ideology,

Ok we do know that IT - which must refer to something that will come along and that must be also something , therefore NOT a person - will underline or make advertisement of the left ideology what is called at the time communism and now is called progressiveness or progression ideology. Always left we are dealing with. To give you an idea the Democratic party in US. Not the same thing but just to have a reference


upon close inspection,

At a close look .............not difficult to grasp. However, the implication of this idiom is HUGE. It has a great impact on the whole sentence, and here is why ?

In the first chunk of the sentence we do know that SOMETHING (IT) has a tendency towards the communism. However, thanks to this idiom - upon close inspection - is suggesting us that IT probably, at the end of the day, will NOT o propagandize a communist ideology after all. Otherwise, the upon close inspection would not have any sense in the economy of the sentence

the philosopher's 1909 treatise ________ his notorious involvement in Leninist communism.

Now we do know what was IT: it was the treatise or , in other words, the opera , the book of the philosopher

Moreover, we do know that the treatise appears to do one thing, but "upon close inspection" it actually does something different or reveals something contradictory about his later involvement.

Therefore we have TWO key points

1) The treatise contradicts what we do know : in other words the philosopher was a communist or at least we believed that and in the end he was NOT

2) Or the treatise , contrary to what we knew, already anticipated what we discover later on. In other words, at a close look of the treatise this opera already anticipated us the reality: communism.

Inthe answer choices there is no trace of the first hypothesis. Therefore we need two words that tell us the anticipation.

B and F are clearly the winner, pretty easily I would say

I hope is clear my explanation