Final answer:
In a Linear Search on an unsorted array of 1,000,000 people, if the person is not present, the computer will check all 1,000,000 entries to conclude the person is not there.
Step-by-step explanation:
When using Linear Search to find an individual in an unsorted array and the person is not present, the computer will look through each entry in the array sequentially until it reaches the end. Since the individual is not in the array, the computer will have to check all 1,000,000 entries before coming to a conclusion that the person is not present in the array. Thus, the correct answer to the question is (c) all 1,000,000 people before it realizes this person is not in the array.