Fifty cents is a plural noun since it is talking about more than one cent. In the example, you would say, "fifty cents <em>is </em>how much I owe you".
Your answer would be c ;)
Answer:
“So”
Explanation:
A conjunction joins two sentences and combines them into one. Here, the two sentences are “Lisbette felt lonely.” and “She called Martine.” Since these are related, we can combine them using the conjunction “so”.
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