What Is the Main Difference Between Benign and Malignant Neoplasms

What is the main difference between benign and malignant neoplasms?

A) Benign neoplasms grow by expansion and remain localized; malignant neoplasms grow by infiltration and metastasize by lymph or blood.
B) Benign neoplasms grow by infiltration and metastasize by expansion and remain localized.
C) Benign neoplasms usually are not encapsulated, compared to malignant neoplasms, which are encapsulated.