With businesses bracing for rate increases, Florida House members this week began grappling with the tricky political and legal challenge of revamping the workers’ compensation insurance system. Staff members held briefings Tuesday and Wednesday to try to help lawmakers understand the complicated system, which is likely to be one of the highest-profile issues of the 2017 legislative session. Meanwhile, a newly elected House Republican released a proposal Wednesday that includes calling for workers’ compensation insurance coverage to be optional for businesses.