Indian Culture
The four important dynasties that stand out prominently in the sixth century B.C. are :

The Haryankas, the Guptas, the Pauravas and Pradyotas.
The Haryankas, the Ikshvakus, the Pauravas and the Mauryas.
The Guptas, the Ikshvakus, the Pauravas and the Mauryas.
The Haryankas, the Ikshvakus, the Pauravas and Pradyotas.

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Environmental Engineering
The polluted water is one which

Consists of undesirable substances rendering it unfit for drinking and domestic use
Is contaminated
Is safe and suitable for drinking and domestic use
Contains pathogenic bacteria

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