A - Best Ans
B - had implies an action that finished in the past, that's not the intend in the comparison.
C - "that there was an elephant" - Is the elephant not there any more?
D - Awkward - gives rides and was earning... It was earning not through the rides but through some other source
E - Complex because in this and structure you try and compare the jobs and earnings of Barbara and the Elephant.
"You miss 100% of the shots you miss to take!" http://www.tarunarora.viviti.com