Which of the following structures reflects parallel structure?
a) Last week, Jorge began a new training regimen, which includes running, swimming, and weightlifting daily.
b) Last week, Jorge began a new training regimen, which includes daily running, swimming, and lifting some weights daily.
c) Last week, Jorge began a new training regimen, which includes a run, a swim, and weightlifting daily.
d) Last week, Jorge began a new training regimen, which includes daily running, to swim, and to lift weights daily.