A developer is creating a JavaScript function to manage a library system. The function needs to declare variables for the book title, author name, and the number of copies available. Which line of code will cause an error?

function manageLibrary() { //Line 1 
	let bookTitle = "JavaScript Essentials"; //Line 2 
	let authorName = "John Doe"; //Line 3 
	let numberOfCopies = 5; //Line 4 
	let book-title = bookTitle + " by " + authorName; //Line 5 
	let totalCopies = numberOfCopies * 2; //Line 6 
	return book-title + " has " + totalCopies + " copies available."; //Line 7 
}

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