Answer:
A). Ambivalent toward the use of smartphones.
Step-by-step explanation:
The inference which can be made on the basis of the given passage would be the author's 'ambivalent approach towards the use of smartphones.' This uncertain or conflicting approach is reflected through the author's portrayal of the other side of the evolution of smartphone technology. He suggests the readers to realize that despite the convenience that smartphones have brought to our life, they need to understand the negative impacts(distraction from study, impact on physical and mental health, widening gap in relations, loss of creativity and imagination, etc.) caused by it. Thus, option A is the correct answer.