In the context of Git version control, if you encounter the error message "another git process seems to be running in this repository, e.g. an editor opened by 'git commit'. please make sure all processes are terminated then try again. if it still fails, a git process may have crashed in this repository remove the file manually to continue," what is the most appropriate first step to resolve the issue?
A) Reinstall Git to ensure all components are up to date.
B) Force quit all applications that are currently open on the computer.
C) Check for and terminate any active Git processes or editors that might be interfering with the repository.
D) Delete the entire repository and re-clone it from the remote source.