With reference to a basic ob model, are determined in advance of the employment relationship and refer to variables such as personality, group structure, and organizational culture that lead to processes.

The OB model stands for Organizational behavior model. This basic structure defines and categorizes the relations between variables at different levels in the organization.
With reference to a basic OB model, inputs are determined in advance of the employment relationship and refer to variables such as personality, group structure, and organizational culture that lead to processes.

Ithink the answer you are looking for is (b).