This is an example of a simile
I think your best choice would be a, but it can very well be d.
Answer:
They indicate that Blanca flor is going to help juanito I think
Explanation:
The answer is the last one, D. All of the other transitions indicate that the writer will either go into further detail on the subject or list other reasons as to why this would be correct. However, D clearly uses a contrasting transition to introduce a new argument.