Step 1: Identify the ruler.
Gautamiputra Satakarni was a prominent ruler of the Satavahana dynasty. He is known from inscriptions such as the Nasik inscription of his mother Gautami Balashri.
Step 2: Understand his policies.
He is known for upholding the varna system and maintaining social order. Historical records suggest that he opposed intermixing of varnas and worked to preserve traditional social divisions.
Step 3: Analyze the options.
• (A) Incorrect. He was not a ruler of the Shaka dynasty.
• (B) Correct. He emphasized maintaining purity of varna system and discouraged intermarriage.
• (C) Incorrect. There is no evidence of such alliance with Gupta rulers.
• (D) Incorrect. Sudarshan lake was rebuilt by Rudradaman, not Gautamiputra Satakarni.
Step 4: Conclusion.
Therefore, the correct statement regarding Gautamiputra Satakarni is that he ensured no intermarriage among the four varnas.
Final Answer: He ensured no intermarriage amongst members of the four varnas.
Two statements are given below as Assertion and Reason (R). Read them carefully and choose the correct option.
Assertion : Harappa was a well-planned city.
Reason (R): It had a well-planned drainage system.
Match Column-I with Column-II and choose the correct option: 
Identify the ancient Indian text with the help of the following information: