Final answer:
Without the specific scores for each test, it is impossible to calculate the exact test averages for either the math or science class after completing test 4, hence we cannot determine which class had the higher average.
The correct answer is D.
Step-by-step explanation:
The question asks us to determine the test averages for two classes after completing test 4, and then compare which class has a higher average. To find the test average after test 4 for the math class, we would need the sum of the scores of all four tests divided by the number of tests, which is 4. Similarly, for the science class, we would also need the total points accumulated across all tests, divided by 4.
Without the exact scores from each test to calculate these averages, we cannot determine the averages or which class has the higher average after test 4. Therefore, for Part A and B, the answer would be (d) Insufficient information to determine, and for Part C, the same applies (d) Insufficient information to determine.