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This is also a good one....shuruwaat toh aldol condensation se hoga. End product has to be aldehyde/ketone, so we can remove B) from probable answers....

ya pritish is ryt..
Btw C and D no. of carbon is increasing.. so i go with A..

See first step is simple Aldol Condensation..carbonion is fromed on the carbon adjacent to the keyone grp on the cylcopentyl ring...
Now AlCl₃ will attack on Oxygen grp..so oxygen leaves...now the doble bond formed in aldol condensation is broken by O₃ so u will get the answer A

thnks