Which question is best answered by an experiment? a. Does a flipped-classroom format increase student success rates in English? b. Is successful completion of a college-level English class within two years of enrolling in college linked with earning a degree or certificate? c. Is entering the remedial English sequence at three levels below transfer associated with lower success rates in subsequent general education classes? d. Are students who participate in an accelerated pathway through college-level English more likely to pass a college-level English class?

The correct option is d.

Step-by-step explanation:

For a question to be answered by an experiment, some conditions need to be satisfied.

An experiment must follow qualitative analysis. In a sense, an experiment must be able to be quantified. Let's take an example:

Suppose a school wants to screen candidates for an entrance level. The candidates must be of a specified number. The exam is taken. The exam scores are tabulated and distributed according to the statistical distribution. In this way, the quantitative distribution in the candidates pass mark cab be quantified.

In the question, the correct option will be d. The program can be tested quantitatively (and generating data).