1. Es una orden que se envía a un objeto para indicarle que realice una acción.

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A.

Encapsulamiento

2.

Es el proceso de capturar los detalles importantes de un objeto mientras suprimen o ignoran los detalles no esenciales.

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B.

Polimorfismo

3.

Es el mecanismo básico de la programación orientada a objetos para ocultar los detalles internos del objeto de los demás objetos.

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C.

Mensaje

4.

Es una de las piedras angulares de la programación orientada a objetos porque permite la creación de clasificaciones jerárquicas.

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D.

Abstracción

5.

Permite referirse a objetos de clases diferentes mediante el mismo elemento del programa y realiza la misma operación de diferentes formas.

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E.

Herencia

There is a paper clip button you click that to add a photo

For question 1, i'm a bit stuck between serif fonts or large enough type to read. serif fonts are good fonts to use because their easy to read. but you also need your type be large enough to read. if i had to say what you need to consider most important, i would say d is the answer.  for question 3, i believe the answer is d. it seems most appropriate to do that. on every page or every other page would be too much, and only on the contact page just seems inappropriate.  for question 4, it's probably a. by "color scheme" it doesn't mean just one color, but a set of colors. colors that are complimentary to each other. having too many is too distracting so it's best to limit it as much as possible, but not to the point where your website looks dull.hope this !