A simple standard definition is normally composed of all of the following exept.

a. characteristic of some class
b.the term to be define
c. A class containing the term to be define
d. the distintive characteristic of the term
I chose A

I don't like these questions. What is meant by "class?" But I'd opt for A also.

dont know this lectures are confusing

Yes, I can see how you might be confused. A dictionary definition of a word may include a sentence in which the word is correctly used. I don't know what a "class" is in this context.

Another poorly written question.

"class" probably should really be "classification" (such as part of speech -- noun, verb, adverb, etc.)

In writing, the art of definition is the art of saying what you mean. That’s a point to keep in mind. To express the purpose of an essay—to inform, to illustrate, to persuade, to compare and contrast—you need to use words that will communicate with your reader.

In the simplest sense, that means making sure your terms are understandable to your likely audience. For example, to be explicit about what you mean, you might write, “The Treaty of Vienna of 1648 ended Europe’s 30-Year War.” Or, when writing about bird watchers, you might write, “Biologists who study birds are called ornithologists; however, hobbyists who love bird watching call themselves birders.”
I found this you think my answer was correct?
A simple standard definition generally has three parts:

1. The term itself
2. The class, group, or category related to that term
3. The characteristics that distinguish the term from all the others in its class or category

If "class" means part of speech (noun, verb, etc.), you are correct.

To determine the correct answer, let’s break down the possible choices:

a. Characteristic of some class: This option seems plausible, as a simple standard definition typically includes the characteristic(s) of a class.

b. The term to be defined: This choice should be included in a standard definition since it is the central focus of the definition.

c. A class containing the term to be defined: It is common for a standard definition to involve a class that encompasses the term being defined.

d. The distinctive characteristic of the term: This option seems relevant as well, as the distinctive characteristic of the term is often an important component of a standard definition.

From the provided options, it appears that all of them could potentially be found in a simple standard definition. Therefore, the correct answer should be none of the above, or "e. All of the above."