According to the passage, in his writing, Mungo Park ----.

Mungo Park was one of the first British explorers in
Africa. In 1799, he published an account of his
journey in West Africa. He was not a professional
writer, but a naval doctor of good education who had
been to Edinburgh University. He wrote not for artistic
effect, but to tell a plain story of his remarkable
adventures. Indeed, he wrote frankly, but without
exaggeration, of his own hardships and sufferings on
the journey. Therefore, his style was direct and free
from affectation and obscurity.