Git version rollback problem

problem description

if there are four git versions, which are A-> B-> C-> D from far and near, and I now roll back to version B through git reset-- hard B, then the C-hard D version after B will be deleted. What can I do if I want to roll back to C now?

Oct.29,2021

git reflog -sharpccommit
git reset --hard c
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e46141-4c28f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e46141-4c28f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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