In Oracle Payroll Cloud, when a worker's payroll frequency changes (e.g., from weekly to monthly), the simplest and recommended action is to transfer the worker from the weekly payroll to the monthly payroll (Option B). This is done via the "Manage Payroll Relationships" task, where you update the payroll assignment to point to the new payroll definition, effective from the desired date. Option A (terminate and create a new assignment) is overly complex and disrupts continuity of employment records. Option C (update payroll definition) is incorrect, as it alters the payroll for all workers, not just one. Option D (end and add payroll record) is not a precise description of the process, as payroll records are not ended individually; the transfer handles this seamlessly. Oracle documentation outlines payroll transfers for frequency changes.

Comprehensive and Detailed in Depth Explanation:
Oracle Payroll Cloud supports importing time card hours from third-party time products directly into payroll using the "Load Time Card" process. This process maps time entries to payroll elements (created with the time category) and integrates them into the payroll calculation. Option B introduces an unnecessary step via Cloud Time and Labour, which is not required for direct payroll integration. Option C is incorrect, as this integration is supported, and Option D (batch loader) is less specific and not the primary method for time imports. The Oracle documentation details this under "Integrating with Third-Party Time Systems."