The correct answer is option 'D', which means that 5 four-wheeler cars will have a total of 20 wheels. Let's break down the answer to understand why.

Understanding the Question:
The question states that there are 5 four-wheeler cars. To determine the number of wheels, we need to calculate how many wheels each car has and then multiply it by the total number of cars.

Calculating the Number of Wheels per Car:
Each four-wheeler car has 4 wheels. This is a standard configuration for most cars, where each wheel supports a corner of the vehicle. Therefore, we can say that each car has 4 wheels.

Calculating the Total Number of Wheels:
Now that we know each car has 4 wheels, we can calculate the total number of wheels by multiplying the number of cars by the number of wheels per car.

Number of cars: 5
Number of wheels per car: 4

Total number of wheels = Number of cars x Number of wheels per car
= 5 x 4
= 20

Therefore, 5 four-wheeler cars will have a total of 20 wheels.

Summary:
- Each four-wheeler car has 4 wheels.
- The total number of wheels can be calculated by multiplying the number of cars by the number of wheels per car.
- In this case, with 5 four-wheeler cars, the total number of wheels is 20.