To solve this question, the user needs to know the definitions of the given options and their meanings in the context of the question.

The correct option for the given question is:

A. Tattler: This option is correct. A tattler is a person who gossips or carries tales, which is exactly what the question is asking for. The word "tattler" is often used to describe someone who spreads rumors or secrets about others.

B. Totter: This option is incorrect. The word "totter" means to sway or wobble unsteadily, often due to weakness or instability. It does not relate to the meaning of the given question.

C. Speaker: This option is incorrect. While a speaker may be someone who talks a lot, it does not necessarily mean that they are a gossip or someone who carries tales. This option is not related to the given question.

D. Leader: This option is incorrect. A leader is someone who guides or directs others, which is not related to the meaning of the given question.

Therefore, the answer is: A. Tattler.