The option that most effectively completes the sentence is “allowing world nations freedom of choice, within reason, promotes peace”. According to John Kennedy in his speech delivered at the American University, nations (in this case he refers to the Soviet Union) should not try to impose rules on other nations as this interferes with the process of peace and creates tension.
New technologies have changed the whole world in scientific matters, social relationships, economy, health, nature, and we could go on with many more examples. One of the things that has been modified with this development is advertising. Now tech marketing is one of the main things to consider if you want to persuade people.
Actually, the classic way to advertise something has been left behind, after tech marketing and media.
The complete predicate of this sentence would be "The temperature reached 115 degrees." Hope this helps :)
C - She greets adults with direct eye contact and a firm handshake.
Indirect characterization shows the character's personality through actions, speech or appearance. Option C is the only one that gave an action.