Which sentence expresses the ideas completely without any unnecessary words or phrases?
a. coffee drinking, in the final analysis, not only increases productivity but as a matter of fact it is also good for your health.
b. coffee drinking, in the final analysis, not only increases productivity but is also good for your health for all intents and purposes.
c. coffee drinking not only increases productivity but is also good for your health, according to several recent objective scientific studies.
d. coffee drinking, in the final analysis, not only increases productivity but in a very real way it also improves health, too.