Congress procession can be allowed:
Explanation:
∵ Route BD cannot be used on Thursday.
∴ BJP has to take out its procession on Friday.
∵ Route DE is common to BJP and Congress.
∴ Congress should take out its procession on Thursday.
∵ Route AB is common to SP and BJP.
∴ SP should take out its procession on Thursday.
∴ BSP and CPM have to take out their processions on Friday.
∴ Congress procession can be allowed only on Thursday.
Hence, option (a).
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