As for this problem, the most probable and the most likely answer to this together with the presented options would be D. Social Networks.
Social networks is the term that defines Internet applications that help people connect with each other through a virtual environment by providing them with a collection of online tools. These tools include the instant messaging, the uploading of pictures and other tools that is found useful in connecting with people online. This has become phenomenon and the most popular social network as of the moment would be Facebook.
When assigning values to a Variable in python, the + operator sums the values assigned to the variable into a single value hence there won't be any space between the values assigned .
