Answer

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**Hint:**The resistance is defined as the opposition offered to the flow of current in a conductor. Resistance is mainly directly proportional to the length of the conductor and inversely proportional to the cross-section area or thickness of the conductor. Here, we will use the formula of resistance which is given below.

**Formula used:**

The formula of resistance of the conductor is given by

$$R = \rho \dfrac{L}{A}$$

Here, $R$ is the resistance, $\rho $ is the specific resistance, also known as resistivity, $L$ is the length of the conductor and $A$ is the area of cross-section or thickness of the conductor.

**Complete step by step answer:**

We can say that the resistance is the hindrance offered to the flow of current in a conductor.

We know that every conductor has a resistance, that is why the conductor gives out heat when current passes through them. The formula of resistance of the conductor is given by

$R = \rho \dfrac{L}{A}$

Therefore, we can say that the resistance of a conductor depends upon the following terms:

-The area of cross-section of the conductor.

-The length of the conductor.

-The resistivity of the conductor.

As we can see that the resistance of a conductor will be directly proportional to the length of the conductor and inversely proportional to the area of cross-section. Therefore, the resistance of the conductor increases with increase in length of the conductor and decrease in thickness or area of cross section of the conductor.

**Hence, option D is the correct.**

**Note:**Here, the resistance of the conductor also depends on the temperature and the material of a conductor. This is because the resistivity depends on the temperature and material of the conductor and resistance depends on the resistivity of the conductor.

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