Answer:
The correct answer is option c. "Karyotype samples to look for unusual size and number of chromosomes".
Explanation:
The number and arrangement of chromosomes are two features that differentiate between a cancer cell that is malignant and a cancer cell that is non malignant. Fortunately, a basic karyotype experiment will be enough to spot a malignant cancer cell. In a karyotype, an unusual large size and an unusual number of chromosomes (aneuploidy) will be indicatives of the presence of malignant cancer cells.