The conjunction 'but' at 'A' is preceded by infinitive marker 'to' suggesting the placement of verb at infinitive. Also, a conjunction is used to join two sentence fragments but the sentence is not fragmented at the position 'A' as there are no independent sentences before or after it. Thus, the verb 'cultivate' which is in its infinitive form, must replace 'but'.
The verb 'cultivate' at 'B' is not efficient to establish the relationship between nouns 'tissues' and 'womb'. But, preposition 'outside' can, so it must replace 'cultivate'.
The preposition 'outside' is incorrectly used to join the two fragments of the sentence which are before and after it, but a conjunction is required to do that. Thus, conjunction 'but' must replace 'outside'.
The correct order is BCA. Hence, the correct answer is option (c).
Correct statement after corrections: In 2008, the Japanese researcher YoshikiSasai showed that it was possible to cultivate artificial human neural tissues outside the womb but unfortunately he has not been able to recreate it.
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