参考答案：C

解析：

When dealing with a crying toddler, the best approach is to talk to the mother and ignore the toddler at first. This approach helps the toddler get used to the nurse before she attempts any procedures. It also gives the toddler an opportunity to see that the mother trusts the nurse. Ignoring the crying and screaming may be the second step. Having the mother hold the toddler will help if she can do this. The last resort is to bring in assistance so the procedure can be completed quickly.