Two petri dishes were on the desktop in Dr. McFarlan's lab.

Dish A had cells with a radius of 2.3 × 10-14 cm. Dish B had cells that had a radius of 3.5 × 10-12 cm. What is the sum of the radii of the two types of cells, using scientific notation?
A.
35.23 × 10-15 cm
B.
3.523 × 10-12 cm
C.
3.523 × 10-16 cm
D.
352.3 × 10-14 cm