Hello.
Written language often requires a more fluent level of comunication, which can prevent people from expressing their attitudes and emotions.
Spoken language, however, allows the speakers to add their own touch to the conversation, like facial expressions and hand movements.
Hope I helped.
Answer: The reason has to do with the fact that the Earth's orbit is not a perfect circle, but is elliptical with the Sun being nearer one end of the ellipse.
From His Diaries
So, the correct answer is
a.His diaries
Compound would be the best answer but has a possibility of being Complex.