Evelyne,

Standard stitch is what we called single crochet in this case, because users from the UK call a single crochet a double crochet. We felt standard would be less confusing than calling it single and double.

C2C is not recommended in this case. A C2C stitch is square, whereas a regular single crochet stitch is rectangular, so your pattern would be skewed. At a future time we'll offer C2C, but it isn't available at the moment and I'm sorry to say we don't have a specific date for when it will be available.