Is defined as the degree to which content is tailored to individual students.

a. interactivity
b. personalization
c. engagement
d. cohesion

B) Personalization

Explanation:

Personalization is defined as the technique in which every individual is considered and their requirement and desires are met accordingly.In terms of student learning, content is usually customized so that it can approach every student individually and create a better understanding environment for everyone.

Other options are incorrect because involvement ,cohesion and interactivity are not related with every single individual to meet their requirement in terms of content.Thus, the correct option is option(B).

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