While all three options can be beneficial for Rod, the most helpful choice for him to achieve his goal of becoming fluent in Russian would be:
c. Rod should set and accomplish some smaller goals that will help him with his larger goals.
By breaking down his long-term goal into smaller, manageable milestones (such as learning a certain number of new words each week, practicing speaking with a language partner, or completing specific language courses), Rod can make tangible progress and build confidence along the way. This approach will keep him motivated and provide a clearer pathway to fluency.