Lucas wants to include an explanation clue in his sentence. How should he do that? He should add words that are similar to the unknown word.
He should add words that are the opposite of the unknown word.
He should add words that give information about the unknown word.
He should add words that are in the same group as the unknown word.

He should add words that are similar to the unknown word.

Explanation:

The inclusion of explanation clues in a sentence is with the intention of giving a more and understandable explanations for any unknown word used. This allows the readers to understand the words that the writer used.

So, for a writer to provide explanation clues, he/she must add words that are similar to the unknown word. This is because similar words will help enable the reader to understand the word(s) used and also help them understand the whole sentence clearer.  Therefore, Lucas should add words similar to the unknown words.

Thus, the correct answer is the first option.

postards have pictures on them, these pictures are things that may never be seen again. the pictures are a part of our history that shows things. because of this many collectors would pay a lot of money for them.

i read on google they "offer a glimpse into the past"

hope this : )

based on the biblical principle philippians 4: 13 "i can do everything through christ who strengthens me." i agree that it is through him that we are given the strength to cope with every situation.

and based on the biblical principle proverbs 16: 32 "better to get angry slowly than to be a hero. better to be even-tempered than to capture a city."   i agree with the author of the passage to the extent that the nobility of heart demonstrates the strength of a person. those who are contemptuous, get angry easily and show their anger toward others are really weak, but those who are noble and make sure to not hurt other people and their feelings are strong people.