Shellshocked by an influential farm irrigation district’s refusal to help pay for the Delta tunnels, advocates of the $17.1 billion project were scrambling Wednesday to salvage it or conjure up a Plan B. Three possible options were floated by California water policymakers for reviving the proposal. All of them face substantial hurdles of their own. Can the tunnels go forward? Here’s a look at the current state – and the immediate future – of the project dubbed California WaterFix by Gov. Jerry Brown’s administration.