What is the name of the diacritical mark, introduced in 1982, that replaced the three accent marks (acute, grave, circumflex) in the polytonic system?

• A breath marks
• B monotonic accent ✓
• C diaeresis
• D apostrophe

The monotonic system, adopted by law in 1982, replaced the three polytonic accents (oxia, varia, perispomeni) with a single acute-like stress mark called the tonos, simplifying written Greek.