As well as a conduit for the vital distribution of oxygen and hydrogen molecules across the planet, the Earth’s oceans provides an effective buffer against much of the Sun’s harmful radiation.
a. As well as a conduit for the vital distribution of oxygen and hydrogen molecules across the planet, the Earth’s oceans provide an effective buffer
b. Besides a conduit for vital distribution of oxygen and hydrogen molecules across the planet, also the Earth’s oceans provide an effective buffer
c. Besides a conduit for the vital distribution of oxygen and hydrogen molecules across the planet, the Earth’s oceans also provide an effective buffering
d. The Earth’s oceans provide not only a conduit for the vital distribution of oxygen and hydrogen molecules across the planet, but also an effective buffer
e. The Earth’s oceans not only provide a medium for the vital distribution of oxygen and hydrogen molecules across the planet but also an effective buffer
I Chose the OA only but, I couldn't also find anything wrong with C, Just that the usage of
"also" seems unnecessary. Please help!!