To answer this question, we need to have some background knowledge about Lopamudra.

Lopamudra is a character from Hindu mythology. She was the wife of the sage Agastya. According to the legend, Lopamudra was a princess who married Agastya and became an accomplished poet herself.

Now, let's go through each option to determine which river Lopamudra became:

Option A) Godavari - Lopamudra did not become the Godavari river.

Option B) Kaveri - Lopamudra became the Kaveri river. This option is correct.

Option C) Narmada - Lopamudra did not become the Narmada river.

Option D) Tapti - Lopamudra did not become the Tapti river.

The correct answer is B) Kaveri. Lopamudra became the Kaveri river.

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