I think it's d. THEN AGAIN i am not completely sure
Answer: a) Tests theory
Explanation:
Test theory is the concept in which researchers are instructed to conduct research or study by comparing class of theory and any particular theory.
According to the question,Chyna's problem is occurring due to tests theory as she is carrying out her study according to comparison with sections of Patricia Alexander's Model of Domain Learning.
Other options are incorrect because replication,generation from library search or personal experiences are not the research process for Chyna's issue. Thus, the correct option is option(a).
The correct answer is option B. Bartolomeu Dias was the first to establish a direct trade network between Portugal and India (the main trade centre at those times). Up to that moment, Europeans could not trade directly with India or Asia without using Middle East route. Since the Otoman Empire had blocked this route, Dias had to find new ones and he did it.