Complete the sentence with the appropriate word. It is claimed that __________…

The correct answer is "competition."

The clue is the phrase "will bring the charges down for people." We need a word that names something which, when present in the telecom industry, lowers prices for consumers. Economically, when several companies compete for the same customers, they cut prices to win business, so competition pushes charges down. The completed sentence reads: "It is claimed that competition in the telecom industry will bring the charges down for people."

The other choices fail on either meaning or logic. "Decrease" and "finance" do not name anything that causes lower charges, and "increase" is self-contradictory — a rise in costs would push charges up, not down. Therefore "competition" is the only word that fits the meaning of the sentence.