Final answer:
None of the multiple-choice options accurately reflects the number of mammal extinctions since 1500 AD. According to the IUCN Red List, 380 vertebrate species became extinct after 1500 AD, which includes mammals.
Step-by-step explanation:
Regarding the question of how many mammal extinctions there have been in the world since 1500 AD, the most accurate information comes from the International Union for Conservation of Nature (IUCN), which maintains a record of extinct and endangered species known as the Red List. Though the list is incomplete, it provides crucial data on historical extinctions and current extinction rates. According to the IUCN, there are 380 vertebrate extinctions recorded after 1500 AD, which includes mammals among other vertebrates. Unfortunately, this number is likely an underestimate due to factors such as species not being described until later and some species that have probably gone extinct without being officially recorded as such.
Considering these factors, the correct answer to the question is not explicitly provided in the choices given. None of the options (A) 50, (B) 100, (C) 150, or (D) 200 are correct since the IUCN states 380 vertebrate extinctions which include mammals. This discrepancy highlights the challenges in quantifying extinction rates and species loss accurately.