What you need to do after that is then restore all the log backups taken on prod between when the backup of FileGroupC was taken and when that last backup was taken. This is because the entire database must be restored to a consistent state and an exact same time.
Other option, if the static filegroup is really static, mark it readonly on production, then restore it once to dev and there will be no need to restore logs.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
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