Option A is
the correct answer because ‘engaged’ means ‘occupied or to use’. Thus, ‘engaged’
is the most appropriate word to describe usage of social media during free time.
Option B is incorrect because ‘employed’ means ‘give work to someone and pay
them or make use of’. Although ‘employed’ is similar in meaning it is not the appropriate
word because youngsters use social media during their free time and are not
paid for it.
Option C is incorrect because ‘involved’ means ‘to participate’. Thus, it is
not the appropriate word to complete the meaning of this sentence.
Option D is incorrect because ‘implicated’ means ‘to be responsible for or to
be involved in a crime’. Thus, it is not the appropriate word to complete the meaning of
this sentence.