14. In a number pyramid, each cell above the bottom row contains the sum of the numbers in the two cells immediately below it. The three numbers on the second row are all equal, and are all integers. Which of these statements must be true?
A The bottom row contains at least one zero
B The third row contains at least one zero
C The top number is a multiple of three
$\mathrm{D}$ The top number is a multiple of four
E None of the above
14. D Let each number in the second row of the number pyramid be $n$. Then the numbers in the third row are both $2 n$ and the top number is $4 n$. So the top number is a multiple of 4 .
Hence option D is correct and therefore option E is incorrect.

Also, the number pyramid above provides counterexamples to options $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$.