Choose the option with the appropriate punctuation inserted in the given sentce. Though the manager explained what to do we didn't know where to go

• A. Though the manager explained, what to do we didn't know, where to go
• B. Though the manager explained what to do, we didn't know where to go.
• C. Though the manager explained what to do, we didn't know where to go.
• D. Though the manager explained what to do, we didn't know where to go.