Select the option that expresses the given sentence in indirect speech.

The professor said to the media persons, “From our research we have come to the conclusion that there is life on that planet.”

The professor said to the media persons that from their research they had come to the conclusion that there was life on that planet.

The correct option is: The professor said to the media persons that from their research they had come to the conclusion that there was life on that planet.

The other options are incorrect:

• "The professor said to the media persons from our research you had come to the conclusion that there was life on that planet." is incorrect because the pronoun is incorrect. The speaker is reporting what the professor said, so the pronoun should be "they" not "you".
• "The professor told to the media persons that from your research you have come to the conclusion that there is life on that planet." is also incorrect because the pronoun is incorrect and the verb tense is incorrect. The pronoun should be "they" and the verb tense should be "had come".
• "The professor informed the media persons that from our research we have come to the conclusion that there had been life on that planet." is incorrect because the verb tense is incorrect. The indirect speech sentence should be in the past perfect tense, not the present perfect tense.