A. You can do the Roth IRA conversions in multiple steps, and use Roth IRA recharacterization to potentially save on tax.
See the hypothetical example below (if you do the Roth IRA conversion in one step, you won't be able to do anything, as shown in the left part of the diagram. However, if you divide the Roth IRA conversion into several parts, you could potentially save on tax by using Roth IRA recharacterization):