Based on the given sentence, "They say that the internet is becoming more popular than television", the correct pronoun is "It"
This refers to the part of speech that is used in the place of a noun in a sentence to denote possession and other functions.
Hence, it can be seen that based on the original sentence, it can be seen that there is no specific person which the action is attributed to, so the pronoun "they" needs to be changed to "It" which becomes, "It is said that the internet is becoming more popular than television",
Read more about pronouns here:
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