A person who did not receive the largest percentage of popular votes can be elected president...
The correct pronoun is their.
Every contestant should wear their best suit on Tuesday.
Their is a personal pronoun that means belonging to or associated with the people or things previously mentioned or easily identified. Therefore the suits belongs to the contestants, there is more than one contestant, we don't know if they are male or female and 'it' refers to objects not people so the correct pronoun is their.
The Ego (reality)
Is the part of the personality
Increased trade across national boarders
The correct answer is C.
The hiking boots and the sleeping bag are two products that she bought and which are necessary for the hiking trip. On the other hand, the want is the pair of jeans, which is a product that she desired and bought, but that is not necessary or useful for the coming trip.