A greenhouse works in a convection way, since sunlight is energy that flows through the greenhouse windows, it then hits a solid surface and turns into heat. Think of it like an convectional oven, the light of the 1100 watt light bulbs used in an electronic oven hits and bounces off the oven walls(which are a solid surface) and turns into heat in order to cook your food.
The correct answer is the second choice, being technical. It is important that a person in telecommunications understand the technology they're working with. Just to clarify, telecommunication refers to communication over large distances using technology. Because of that, it is vital that they are able to use the technology that is a key part of their career.
The first choice, being creative, would be more useful for a career in art, literature, or music. The third choice, being objective, would be best for someone in the judicial branch; it is imperative that a judge be impartial to the people in their court. The final choice, being aggressive, isn't useful for any legal career that I can think of. Therefore, the most sensible choice is the second, being technical.