单项选择题

Tech Addiction" Harms Learning"
The study of 267 pupils aged 11 to 18 -Techno Addicts: Young Person Addiction to Technology-was carried out by researchers at Cranfield School of Management. Northampton Business School and academic consultancy AJM Associates.
Researchers used a written questionnaire to examine the nature and the volume of mobile phone calls and text messaging as well as computer use including e - mail, instant messaging and accessing social networking sites.
They found 62% first used or owned a computer before the age of eight, 80% first used the internet between the ages of five and 10,58% first used a mobile Phone between the ages of eight and 10 and 58% have had access to a social networking sites between the ages of eleven and 13.
Over 63% felt addicted to the internet. Over 30% reported spending between one or two hours a day using the internet and 26% said they spent up to six or more hours a day.
On average, pupils said they spent between one and two hours on social networking sites each day.
Over one in five(20.2% )said they left the phone on in lessons—which is usually forbidden by schools.
Over a third (39%) admitted that text shortcuts damaged the quality of their written English, particularly when it came to spelling.
And 84% openly admitted copying chunks of information from the internet into their homework or projects on a number of occasions.
Poor attention levels
Dr Nada Kakabadse from Northampton Business School said modern technology, such as mobile phones and handheld computer games, was having an impact on pupils’ attention levels.
"They are hiding these things under the desks so their concentration cannot be equally divided, they ore not focusing on what’s going on in class."
Dr Kakabadse said pupils were also getting into a bad habit of plagiarism.
"For their homework, instead of reading the book, they go on the internet and lift it. "
She also raised concerns about the text - messaging abbreviations to which young people had grown accustomed.
"They have invented a new language. This kind of abbreviation they unconsciously bring into their assignments. "
"So they will have difficulty communicating with others and making themselves understood. Of course, language should evolve but maybe not so quickly. \
Why did Dr Nada Kakabadse say mobile phones were having an impact on pupils’ attention levels

A.Pupils use abbreviations to write the homework.
B.The phones diverted their attention away from the class.
C.The phones would rings occasionally during the class.
D.The phones have entertainment games to attract pupils.