Answer:
D
Explanation:
Sales mix is a ratio of products sold. In this case, sales by golf ball type as a percentage of total sales is the sales mix as it shows the ratio of product sold.
Answer: b. Is the Chinese food that you gave up when you chose to eat Italian food.
Explanation: Opportunity cost refers to the cost of the next best alternative foregone or sacrificed. When an individual chooses to take a certain action, then his opportunity cost of doing that will be the alternatives that he has foregone.
IT can be expresses as,

When the individual chooses Chinese food when he could have choose to eat Italian food, his opportunity cost will be the Chinese food that you gave up.
For other options there is no information on what was given up.
Answer:
The correct answer is the option C: Search engine optimization.
Explanation:
To begin with, the name of "Search Engine Optimization" or SEO refers to the process used by companies that focus on improving the quality and quantity of the website traffic related to a website that comes from search engines. Meaning that this process seeks for the way to get those websites to be find more easily by the consumers depending on how much related they are to what the consumers look for on the engine searchers. That is why that in this case, Austere Realty is actively engaged in search engine optimization due to the fact that they always ensure that its web page shows up high amoing the list of results of the search engine.
The answer is data backup and collaboration.