Answer:
Option d is correct.
Step-by-step explanation:
Continuous relationship is the values that a function can take any that means even decimal value in finite or infinite interval.
Discrete is the value purely integer no fractional part should be there.
The best option that best modeled the continuous relationship is the temperature inside a car over time because it is purely continuous because we can have temperature like 20.5 degree Celsius.
All the above three options will be discrete as well as continuous but the fourth option will be continuous.