Suppose G be a connected planar graph of order n 5 and size m. If the length of the smallest cycle in G is 5, then which of the following is true?

Suppose G be a connected planar graph of order n 5 and size m. If the

1.	Suppose G be a connected planar graph of order n 5 and size m. If the length of the smallest cycle in G is 5, then which of the following is true?
A.	(m+n)<sup>4</sup>>=mn
B.	m 5/3(n 2)
C.	(m<sup>2</sup>+n)/3
D.	n>=(6/5)(n+1)
Answer» C. (m<sup>2</sup>+n)/3