Which of the following declares a five-element one-dimensional array?

The correct answer is: B. Dim dblAmounts(5) As Double

A one-dimensional array is an array that has only one dimension. In other words, it is a list of items that are all of the same type. The number of items in a one-dimensional array is called the size of the array.

The syntax for declaring a one-dimensional array in Visual Basic is:

Dim arrayName(size) As type

where:

• arrayName is the name of the array.
• size is the number of items in the array.
• type is the type of the items in the array.

In option A, Dim dblAmounts(4) As Double, dblAmounts is the name of the array, 4 is the size of the array, and Double is the type of the items in the array. Therefore, this option declares a five-element one-dimensional array of type Double.

In option B, Dim dblAmounts(5) As Double, dblAmounts is the name of the array, 5 is the size of the array, and Double is the type of the items in the array. Therefore, this option also declares a five-element one-dimensional array of type Double.

In option C, Dim dblAmounts(4) As Double = {3.55, 6.70, 8, 4, 2.34}, dblAmounts is the name of the array, 4 is the size of the array, and Double is the type of the items in the array. However, the array is also initialized with the values 3.55, 6.70, 8, 4, and 2.34. This is not necessary to declare an array, and it does not affect the size of the array.

In option D, Dim dblAmounts() As Double={3.55, 6.70, 8, 4, 2.34,1.45}, dblAmounts is the name of the array, and Double is the type of the items in the array. However, the size of the array is not specified. This means that the array will have a variable size, and it will be able to store any number of items. This is not a good practice, as it can make your code difficult to read and understand.

Therefore, the correct answer is option B.