Four phrases/sentences have been removed from the text below. For each question, mark the letter A, B, C, or D on your answer sheet to indicate the correct option that best fits each of the numbered

Digital technologies have remarkably changed teenagers’ life and work both positively and negatively. According to UNICEF, 71% of 15–24-year-olds are online and one-third of Internet users are under 18 years old.
Teenagers benefit from the advances in technology. ___(1)___. They have various devices like computers, tablets, smartphones, and applications to improve the ways they learn, broaden their relationships, and spend their leisure time. They have more opportunities to learn, get access to information, and use different communication channels inexpensively.
However, they also face many risks. ___(2)___. Statistics show that teens spend less time doing physical activities, and many more teens suffer from obesity, bone and eye problems. ___(3)___. In fact, cyber-bullying on the Internet has become more serious than bullying at school.
Schools and parents should guide children so that they can use devices wisely and not become victims of those devices and technologies. ___(4)___.

A. They can access knowledge and communicate easily.
B. Parents should educate their children about safe Internet use.
C. One major concern is the impact on physical and mental health.
D. Moreover, teens are also at risk of visiting websites which promote self-harm or suicide