Correct answer: A) Procedural error
Procedural error is the error in which while conducting the experiment the scientist follow a wrong procedure which result in the negative result of the scientific experiment.
Example: While performing a experiment in which heating is required, procedural error occurs when a something is being heated a lid is not put on it, or missing a step, or heating it to a wrong temperature are the procedural error in the experiment which result in the negative result of the experiment.