Which of the following statements is correct?

All three statements are correct, so All of the above holds.

The objectives of research are indeed stated in the first chapter of the thesis.

A researcher must possess analytical ability to interpret findings soundly.

Variability among cases or conditions is a genuine source of research problems.

Each single statement is true on its own, so none is the sole answer.

Together they reflect the planning, skills and origins that shape good research.