IMO: C

The meaning of the sentence is
Though it(Paris Commune) existed only for short period (between March 18 and May 28, 1871) it seems to have embodied the vision of Social democracy,M1 ,but the leader's failure to something suggests that anarchist tendencies contributed to its downfall

Modifer1 (m1) describes what social democracy is

A,D- seems as embodying - says that is it currently embodying not that the action of embodying started in past. Also if you see the sentence after 'BUT' the verb is 'contributed ' means past so we need embody also in past
Also the sentence needs to be parallel to setence after BUT
' leaders' failure to X suggests that Y contributed to Z'
C- looks ok
seems 'to have embodied' the vision is parallel to 'contributed'

E - also looks OK for same reason as above but notice the difference is between 'seems' and 'seemed'
E says it no more seems to have embodied the vision.
C is better as we feel in present time that Paris Commune embodied the vision and this feeling is still true in present time from Original sentence(A) and E changes this meaning

As C preserves the meaning, I would go with C

Whats the OA

I would also go with C.

I would go with E. C and E are VERY similar and the only answer choices to jump out at me. E has "seemed" which in my opinion would descibe the past correctly as we are given a timeline in the past. Present= She "seems" to like his music. Past= He "seemed" very happy yesterday.

OA please?

Thanks

I would go with E. C and E are VERY similar and the only answer choices to jump out at me. E has "seemed" which in my opinion would descibe the past correctly as we are given a timeline in the past. Present= She "seems" to like his music. Past= He "seemed" very happy yesterday.

OA please?

Thanks

One key point to be aware of is that we have a present tense verb ("suggests") in the second clause (which is not underlined). That may be important for determining which tense we need for seems/seemed.