There are 13 left-handed and 21 right-handed spirals on the cacti in the photograph. What is special about these numbers?
A. The value of the 13th term of the pyramidal sequence is 21.
B. They are consecutive terms in the pyramidal sequence.
C. The value of the 13th term of the Fibonacci sequence is 21.
D. They are consecutive terms in the Fibonacci sequence.
THE CORRECT ANSWER IS D!