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A study was done to determine whether having a parent who smokes in the house has any effect on whether or not children develop asthma later in life.

Over a period of several years, the study followed the health records of $140$ children whose parent(s) smoked in the house and $140$ children whose parent(s) were non-smokers and compared the rates of asthma in these individuals at the age of $25$.

Which of the following BEST describes how the study was conducted?


This was an experiment with both a treatment group and a control group.


This was a comparative experiment using block design.


This was an experiment conducted without the use of blinding.


This was a long-term observational study.


This was a survey.

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