How did Johann Sebastian Bach use dynamics in his music? Or if he did use dynamics at all?

After auditioning for a new position in Leipzig, Bach signed a contract to become the new organist and teacher at St. Thomas Church. He was required to teach at the Thomas School as a part of his position as well. With new music needed for services each week, Bach threw himself into writing cantatas. Johann Sebastian Bach is regarded as one of the greatest composers of all time. He is celebrated as the creator of many masterpieces of church and instrumental music. His compositions represent the best of the Baroque era. Bach's music was made through faith, but it transcends faith. He humanises the Lutheran theology of his time and makes it approachable. He makes it speak to people of all beliefs, and of none.

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what are the choices?