Correct Answer: least

Solution : The correct choice is the fourth option .

The sentence structure suggests a progression of positive attributes related to the television, and the term least appropriately concludes the list by indicating that the television is not only big, has an excellent picture, but is also inexpensive. This creates a sense of contrast, emphasising that affordability is a noteworthy aspect.

The meanings of the other options are as follows:

• Close means nearness or proximity.
• Final means last in a sequence, marking the end.
• End means conclusion or termination.

Therefore, the complete sentence is: "The television is big, has an excellent picture, and last but not least, it's cheap."