Answer:
There are 65,536 ways.
Step-by-step explanation:
This can be calculated using the rule of multiplication as:
 4        *    4   *   4  *   4  *  4   *  4   *  4  *  4   = 65,536
1st Question   2nd   3rd    4th     5th   6th    7th    8th
Because the science test have 4 possible options in every question.
Then, there are 65,536 ways to answer the question.