please tell me if 18 is correct and help with 19 and 20

The center of gravity method of location is most appropriate in making a decision about the costs of transportation True False QUESTION 19 One of the advantages of contract manufacturing is the customization of goods in regional markets, True False QUESTION 20 A skyscraper is an example of a. A custom made to order product b. An option or assemble to order product C. A project d. A job shop process