About the sentence “Although there are no official numbers ...

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Q3891102 Inglês
The three passages below are part of the paper “Elite bilingual education in Brazil: an applied linguist’s perspective. Read them and answer question


LIBERALI, Fernanda; MEGALE, Antonieta. Elite bilingual education in Brazil: an applied linguist’s perspective. Colombian Applied Linguistics Journal, 2016, v.18, 95-108. 
About the sentence “Although there are no official numbers due to this lack of regulation, it is possible to picture the expansion of bilingual schools based on research data and publishing houses.”
Which alternative correctly rewrites the sentence in the passive voice?
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