Paul Laurence Dunbar was born in Dayton, Ohio, in 1872, the son of two former slaves. When Dunbar was a young man, his mother encouraged him to read. He started reading, reciting, and writing poetry by the age of six. After receiving his education, Dunbar continued writing and worked as an elevator operator to help pay his bills. After publishing two poetry collections, Dunbar was well-known around the country. Today, many people still celebrate Dunbar's writing and honor his talent. Which of these is the BEST topic sentence for the composition? A)Paul Laurence Dunbar was a famous poet during the early 1900s in America. B)Many famous American writers and poets emerged during the early 1900s. C)Poets are creative people who help to change the places they live. D)A few well-known American poets lived during the early 1900s.

answer: carbon 14 can only be used to determine the age of the organisms that were once living, and igneous rocks are non living.

explanation:

carbon 14 dating is used to determine the age of the sample by estimating the amount of carbon 14 present in the sample and then comparing it with a reference standard.carbon 14 is a isotope of carbon which is radioactive and unstable. carbon 14 is assimilated by all plants and animals throughout their life from carbon dioxide. however, one the organisms die they stop this assimilation and the carbon 14 content starts to decrease.by knowing how much of carbon 14 is left in an organism after his death, one can estimate the age of the organism. the materials whose age can be estimated by carbon 14 method are the organic compounds. however, some inorganic compounds such as aragonite   shell can also be dated.however, if we consider the igneous rocks it is a non living component which never accumulated carbon 14 in it and thus, we cannot use carbon 14 dating method to estimate its age.