Which of these sentences uses a voice and style most suitable for fifth-grade american students?
a. it seems proper that i should prefix to the following biographical sketch some mention of the reasons which have made me think it desirable that i should leave behind me such a memorial of so uneventful a life as mine.
b. i should mention why i want to leave behind a record of my uneventful life.
c. it seems to me that it is proper to mention the reasons for sketching my uneventful life and leaving behind its memorial.
d. that i should leave behind such a memorial of my uneventful life requires reasons for my doing so and i should mention those.