Does the sentence "The primacy of the composer's written score has also led, today, to a relatively minor role played by improvisation in classical music, in sharp contrast to the practice of musicians who lived during the baroque, classical and romantic era." provide a valid answer to the question "When was improvisation in classical music performance common?"

A: no

Does the sentence "A small number of videos, such as the weekly addresses by President Barack Obama, can be downloaded as MP4 files." provide a valid answer to the question "Which videos are often available for download straight from youtube?"

A: yes

Does the sentence "China National Petroleum Corp and Sinopec donated 10 million yuan each to the disaster area." provide a valid answer to the question "How much have Central state enterprises donated?"

A: no

Does the sentence "The municipality is a net importer of workers, with about 5.7 workers entering the municipality for every one leaving." provide a valid answer to the question "How many workers commute into the municipality?"

A:
no