A rectangle has an area of k2 + 19k + 60 square inches. If the value of k and the dimensions of the rectangle are all natural numbers, which statement about the rectangle could be true?
A- The length of the rectangle is k – 5 inches.
B- The width of the rectangle is k + 4 inches.
C- The length of the rectangle is k – 20 inches.
D- The width of the rectangle is k + 10 inches.