Answer:
The concept that is used to represent the situation in this sentence:
It can be dangerous to carelessly teach grammar to students
Is:
b) Split infinitive
Step-by-step explanation:
A split infinitive is a concept to identify and describe when a word or phrase comes between the to and the bare infinitive of the to form o the infinitive. It helps you describe with more detail a concept. In our case, it is used to explain how one effect can have a perspective to be described and expand the understanding of the reader.