The question is asking which one of the options is not correctly matched in terms of the ruler and the dynasty they belong to. Let`s analyze each option:
1) Bimbsara: Magadha - This is a correct match as Bimbsara was a ruler of the Magadha dynasty.
2) Bindusara: Maurya - This is also a correct match as Bindusara was a ruler of the Maurya dynasty.
3) Agnimitra: Sunga - This is a correct match as Agnimitra was a ruler of the Sunga dynasty.
4) Shashanka: Kanva - This option is where the correct match is not made. Shashanka actually belonged to the Gauda dynasty, not the Kanva dynasty.
Therefore, the correct answer is option 4. Alert - correct answer should be Shashanka: Gauda.