Does the sentence "In 2012, A. L. Arefyev published a new study "Russian language at the turn of the 20th-21st centuries", in which he confirmed his conclusion about the trend of further weakening of the Russian language in all regions of the world (findings published in 2013 in the journal "Demoskop Weekly")." provide a valid answer to the question "When was "Russian language at the turn of the 20th-21st centuries" published?"

A: yes

Does the sentence "These troubles were followed in 1347 by the Black Death, a pandemic that spread throughout Europe during the following three years.[AC]" provide a valid answer to the question "How many million people died from the Black Death?"

A: no

Does the sentence "Local buses in Utrecht are operated by Qbuzz its services include a high-frequency service to the Uithof university district." provide a valid answer to the question "What is one of Europes cleanest"

A: no

Does the sentence "These act by binding to transcription factors which then cause the DNA to loop so that the regulatory sequence (and bound transcription factor) become close to the RNA polymerase binding site." provide a valid answer to the question "What happens when a regulatory region binds to transcription factors?"

A:
yes