'Compound words are formed when two or more words are put together to form a new word, generally with a new meaning.'
Option D: 'Head' forms a compound noun with 'master': headmaster.
A 'headmaster' is 'the principal of a private school', or 'the head of a school'.
Hence option D is correct.
Options A, B and C: 'Head' does not form a compound word with 'role', 'leader' or 'manager'.
The words 'headrole', 'headleader' and 'headmanager' do not exist in standard English language.
Hence, options A, B and C are wrong.