Explanation:

- The last ruler of the Mauryan dynasty was Brihadratha.

- Brihadratha was killed by Pushyamitra Shunga, who then went on to establish the Shunga dynasty.

- Devavarman: He was a Mauryan ruler but not the last one; he ruled before Brihadratha.

- Bindusara: He was the father of Ashoka and ruled before Devavarman.

- Dasharatha: He was also an earlier Mauryan ruler, known to be Ashoka's immediate successor.

Based on the above, your statement is correct.

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