Chinese parents pay more and more attention to children's reading. Most parents want their children to read more and read well. In 2018, 70.3% of families in a city had the habit of parents accompanying their children to read. The number of books read by parents and children increased by 1.8 compared with 2017. The percentage of time is also longer than last year; however, the city's per capita reading volume of children's books in 2018 was only 4.72, a decrease of 0.6 percentage points from 2017. Which of the following, if true, best explains the above phenomenon? ['In recent years, children\'s academic burdens have been heavier, and many people who read outside the classroom are "overwhelmed but not enough".', 'Most post-80s and post-90s parents are highly educated, and they value the significance of parent-child reading.', 'Many children are accustomed to "listening" in parent-child reading, which is not counted in 2018.', "Parents' electronic reading on mobile phones and computers has not been considered in children's book reading."]