Hello,
Here is your answer:
The proper answer to this question is option A "determining point of diminishing returns"! That because the government uses that to get taxes back!
Your answer is A!
If you need any ore help feel free to ask me!
Hope this helps!
For breaking down lactose
Answer:

point mutation, change within a gene in which one base pair in the DNA sequence is altered. Point mutations are frequently the result of mistakes made during DNA replication, although modification of DNA, such as through exposure to X-rays or to ultraviolet radiation, also can induce point mutations
Answer:
The area under a speed-time graph represents the distance travelled.