The correct answer is D. Shaving cream is an example of a gel.
A gel is a colloid, a mixture of two or more substances where one of them is dispersed in the other. In a gel, the dispersed phase is a solid and the continuous phase is a liquid. The solid particles are so small that they do not settle out of the liquid, and the liquid is held together by the solid particles. This gives gels their characteristic properties, such as their ability to hold their shape and their resistance to flow.
Cheese is an example of a solid colloid, where the dispersed phase is solid fat and the continuous phase is liquid water. Milk is an example of an emulsion, a colloid where the dispersed phase is one liquid and the continuous phase is another liquid. Face cream is an example of a lotion, a colloid where the dispersed phase is a solid and the continuous phase is a liquid.
Shaving cream is an example of a gel because it is a colloid where the dispersed phase is a solid (tiny soap bubbles) and the continuous phase is a liquid (water). The soap bubbles are so small that they do not settle out of the water, and the water is held together by the soap bubbles. This gives shaving cream its characteristic properties, such as its ability to hold its shape and its resistance to flow.