I am in synch on the parallelism in D and with the choices selection of other members. However, I will risk C. - right, I also laughed - but to get the discussion into a different dimension, I will see if I can defend my choice.
My contention is that you dont want '
to make mistakes'. you are 'making mistakes' by chance and 'by virtue of making mistakes you progress' - this is the effect the sentence expects I suppose.
We hear people say 'you're going
to make mistakes, if you dont practice enough' - this is when they wanted to warn you about the potential to doing a mistake. However the same people would say 'You are making a big mistake...' when they see you do a mistake. In this context 'to make mistakes' is discrediting the effect. There is this famous quote 'Making mistakes simply means you are learning faster'
So, 'making mistakes' and 'to accept them' seem right.
Also 'living life fully' is a more popular usage than 'to live life fully'.
I presume here that Paul is testing 'superficial parallelism' to 'actual parallelism'.
If it happens to be D - go easy on me guys, maybe I am 'making a mistake!'
Lastochka, to answer your question, look at this example,
He like
to swim, to jog and to play.
He likes
to swim, jog and play.
Both the sentences are right. 'to'
need not be repeated before jog and play.