What do you guys think it
its psychology

I believe the answer is C - A company opens a new factory and employs more workers.

To me I think that it would be one of the last two because they are showing the most growth out of the four, but if I could only choose one answer I would choose A the third one because it shows how a company is expanding and growing a new piece of the business. 

Pe.dometer would be the most useful to you for monitoring heart rate.