Words are:

A. convenient communication shortcuts
B. not arbitrary symbols
C. unique to each individual in English
D. thoughts written down

There's only one obvious answer for this. What do you think it is?

Good heavens, no! Young children who cannot write certainly speak words.

Illiterate people certainly speak words.

Right -- A.

Preschoolers use private speech to because it's more efficient

The first language arts skill that children learn is:

The correct answer is B. not arbitrary symbols.

To arrive at this conclusion, we need to analyze each of the given options:

A. "Convenient communication shortcuts" is not an accurate definition for words. While words do provide a convenient way to communicate ideas, they are more than just shortcuts. Words have specific meanings and can convey complex concepts.

B. "Not arbitrary symbols" is the correct definition for words. Unlike arbitrary symbols, words have meaning and are used to represent specific objects, actions, or concepts. They have a relationship to what they represent.

C. "Unique to each individual in English" is not correct. While individuals may have unique vocabularies or linguistic styles, words themselves are not unique to each individual in English or any other language. Words are shared and understood by a group or community of speakers.

D. "Thoughts written down" is not an accurate definition either. While words can be used to express thoughts when written down, they are not exclusively thoughts themselves. Words exist whether or not they are written down and serve as tools for communication, both written and spoken.

Therefore, based on the options provided, option B is the most accurate definition for words. They are not arbitrary symbols, but rather have meaning and represent specific ideas or concepts.