In 2008,BlackBerry's Market Cap Peaked at $75 Billion

In 2008,BlackBerry's market cap peaked at $75 billion.By 2015 this valuation had fallen more than 90 percent,to less than $7 billion.BlackBerry fell victim to two important PESTEL factors in its external environment: sociocultural and technological.How did technology contribute to BlackBerry's decline?

A) BlackBerry failed to offer strong security features for its device.
B) BlackBerry failed to change its device into one that could perform multiple tasks effectively.
C) BlackBerry failed to adapt to a groundswell that involved workers bringing mobile devices to work.
D) BlackBerry failed to produce an efficient emailing system using a keyboard.