Figure 5-1 Use the Figure to Answer the Corresponding Question(s)

Figure 5-1
Use the figure to answer the corresponding question(s) .
-Refer to Figure 5-1.Which of the following statements about the red blood cells in Figure B is true?

A) These red blood cells have been placed in an isotonic solution.
B) These red blood cells have swollen in response to a hypertonic external solution.
C) These red blood cells have swollen in response to a hypotonic external solution.
D) These red blood cells have shrunken in response to a hypertonic external solution.
E) These red blood cells have shrunken in response to a hypotonic external solution.