I believe the answer u are looking for is c......You can use the reference to support your claim. however be careful that you still use updated information as well
Answer: Matched pairs design
Explanation:
A matched pairs design is a type of study used when 2 treaments are present in an experiment. The individuals in the design can be divided into pairs using a blocking variable, and each pair can then be allocated to treatments at random. This is thus a special type of randomized block design.
In this case the blocking variable can be the various urban areas as 1968 is matched against 1972. Each city can be compared based on 2 measurements. From their each individual can be grouped into pairs and allocated to different treatments.
Answer:
Diversification
Explanation:
The key words here are 'several businesses'. A company engage in many businesses in order to mitigate or reduce its business risk, and also to create and add more value to customers. This offers a far advantage position than a stand alone entities who deal with only one product or service.