In 2018, China stopped importing recyclables from the United States and other countries. China now requires that imported recyclables not exceed a contamination rate of %.

the correct answer would be b, when, queen, calder hall and london.

explanation:

we always capitalize words when a paragraph or sentence is starting, when an important name is used, when a place is being written, or simply when a noun is used, etc. so in this sentence, sentence is starting from 'when', so it will be written in capital letters. secondly, queen is considered to be an important person, so it will also be written in capital letter. next, the name of the town is mentioned, i-e calder hall, which will also be written in capital letters. in the last,   city name is being used, 'london', which will also be written in capital letters. so option b is the most appropriate one.

b is the correct answer

answer; someone must cover the cost associated with the provision of scarce goods in both sectors;

answer(d) all of the choices are correct;