Which one of the following statements regarding the Gupta queen Dhruvadevi is not Correct?

Correct option is B

The statement regarding the Gupta queen Dhruvadevi that is not correct is:  She was the mother of Prabhawati Gupta

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Wife of Chandragupta II: Dhruvadevi (also known as Dhruvaswamini) was the principal queen (Mahadevi) of the great Gupta emperor Chandragupta II (c. 375–415 CE). This makes statement (4) Correct.
Mother of Kumaragupta I: She was the mother of Chandragupta II's successor, Kumaragupta I (c. 415–455 CE). This makes statement (1) Correct.
Wife of Ramagupta: According to the Sanskrit drama Devichandraguptam and other historical traditions, she was initially the wife of Chandragupta II's elder brother, Ramagupta. Chandragupta II allegedly killed Ramagupta and married Dhruvadevi. This makes statement (3) Correct according to the accepted historical narrative based on this tradition.

Mother of Prabhawati Gupta: Prabhawati Gupta was the daughter of Chandragupta II and his other wife, Kuberanaga, who belonged to the Naga dynasty. She was not Dhruvadevi's daughter. This makes statement (2) Not Correct.