Final Answer:
The man is carrying the rectangle with both hands, thus the correct option is 3.
Explanation:
In the given question, the four provided options are Holding it above his head, Balancing it on his shoulder, Carrying it with both hands and Bending his arm to hold it. Out of these options, the most suitable option is Carrying it with both hands. This is because it is the most practical option that allows the man to carry the rectangle in a secure and steady manner.
In comparison, Holding it above his head is not a practical option as it requires the man to have better upper body strength and balance than he would have while carrying it with both hands. Similarly, Balancing it on his shoulder is also not a practical option as it requires the man to have better balance and coordination than carrying it with both hands. Lastly, Bending his arm to hold it is also not a practical option as it requires a lot more effort and balance than carrying it with both hands.
Therefore, Carrying it with both hands is the most suitable option as it allows the man to carry the rectangle in a secure and steady manner. This option also provides the man with better balance and coordination compared to the other three options. Thus, the man is carrying the rectangle with both hands.