Final answer:
Most children entering kindergarten can count, write, and speak to some degree, but they are just beginning to learn to read, which is not typically fully developed at this stage.
Step-by-step explanation:
Most children entering kindergarten have rapidly developing cognitive and psychosocial skills. However, among the options provided - reading, writing, counting, and speaking - the ability to read is commonly the one that is not fully developed in most children at this stage. While many kindergarteners can recognize letters and may even be able to write some letters and numbers, full reading capacity is something they are still developing and varies significantly among children. Some can read simple words or phrases, but most are at the beginning stages of learning to read.
Kindergarten-aged children typically can count to some degree (often past 20 and sometimes up to 100), have begun to write by tracing letters with pencils, and are generally able to speak in sentences and carry on conversations. The learning environment in kindergarten is tailored to refine these skills and to socialize children into classroom norms, such as playing together and waiting in line, as well as starting to learn academic subjects.