The invention of the elevator in the mid-nineteenth century was significant not only for the
convenience it represented, also it ushered in a new era in architecture, allowing buildings to become increasingly tall.
A) not only for the convenience it represented, also it ushered in a new era in architecture
B) not only for the convenience it represented; it also ushered in a new era in architecture
C) not only because it represented convenience, but also because it ushered in a new era in architecture
D) not just for the convenience it represented, but also because it ushered in a new era in architecture
E) for the convenience it represented not only in addition to ushering in a new era in architecture

Answer C What is wrong with Option D