Read the following article and answer the question. Article: Millions of youngsters across Europe could suffer permanent hearing loss after five years if they listen to MP3 players at too high a volume for more than five hours a week, EU scientists warned. The scientists' study, requested by the European Commission, attacked the concept of "leisure noise," saying children and teenagers should be protected from increasingly high sound levels---with loud mobile phones also coming in for criticism . "There has been increasing concern about exposure from the new generation of personal music players which can reproduce sounds at very high volumes without loss of quality," the Commission, the EU's executive arm, said in a statement. "Risk for hearing damage depends on sound level and exposure time," it said. More and more young people _ the great threat that leisure noise posed to hearing, it said. Commission experts said that between 50 and 100 million people listen to portable music players on a daily basis. If they listened for only five hours a week at more than 89 decibels , they would already be beyond EU limits for noise allowed in the workplace, they said. But if they listened for longer periods, they risked permanent hearing loss after five years. The scientists calculated the number of people in that risk category at between five and 10 percent of listeners, meaning up to 10 million people in the European Union. Sales of personal music players have soared in EU countries in recent years, particularly of MP3 players. "I am worried that so many young people ... who are frequent users of personal music players and mobile phones at high acoustic levels, may be unknowingly damaging their hearing ," she said in the statement. Question: From the passage we know that _ . Answer:

pick from the following.
a). besides the high sound levels, scientists also criticized loud mobile phones..
b). if one listened for 5 hours more a week at 100 decibels, he would risk permanent hearing loss..
c). it is only the level of the sound that can do damage to hearing..
d). the scientists said there were 5-10 percent of MP3 listeners risking hearing loss around the world..
The answer is:
d).