Which command would correctly move a file named class.txt to a directory called MyClass?

The command that would correctly move the file named class.txt to a directory called MyClass is the one that uses the syntax "mv class.txt MyClass." In Unix-like operating systems, the 'mv' command is used for moving files and directories, and it requires the source file to be specified first, followed by the destination directory.

In this case, "class.txt" is the file being moved, and "MyClass" is the directory where the file should be placed. When executed correctly, the command takes class.txt from its current location and relocates it to the specified directory, MyClass. The command is direct and utilizes the proper syntax and format required for the operation.

The other options do not follow the correct syntax for moving files in a Unix-like shell environment, which clarifies their inapplicability for this operation.