The correct answer is: C. Ceramic capacitor.
Ceramic capacitors have the smallest dimensions of all the capacitors listed. This is because they are made of a ceramic material, which is a very good insulator. This means that they can be made very small without losing their capacitance.
Aluminium foil capacitors are made of two pieces of aluminium foil separated by a dielectric material. The dielectric material can be paper, plastic, or ceramic. The aluminium foil is then rolled up and sealed in a metal case. This type of capacitor is larger than a ceramic capacitor because it has more material in it.
Mica capacitors are made of mica, which is a type of mineral. Mica is a very good insulator, so it can be used to make capacitors with a high capacitance. However, mica is also a very brittle material, so it is not as strong as ceramic. This means that mica capacitors are usually larger than ceramic capacitors.
Paper capacitors are made of two pieces of paper separated by a dielectric material. The dielectric material can be waxed paper, plastic, or ceramic. The paper is then rolled up and sealed in a metal case. This type of capacitor is the largest of all the capacitors listed because it has the most material in it.
In conclusion, ceramic capacitors have the smallest dimensions of all the capacitors listed. This is because they are made of a ceramic material, which is a very good insulator. This means that they can be made very small without losing their capacitance.