Context clues are used to (option 1) <span>Decipher the meaning of an unknown word.
When you do not know the meaning of a word, it is possible to look at what comes before and after it, the surroundings which are going to give you context clues to infer the meaning. there are 6 types of context clue, for example, root words and affix, contrast, logic, definition, etc. </span>
commas are necesarry when there is a sequence or list of numbers ex 2, 4, 6, 8, and so on but if it looked like this
2
4
6
8 in a vertical column, there is no need for them
do you mean the letters? If so what do you need the topic scentence to be about