Read the following excerpt from the poem. They ripple tensely, they can hardly contain their happiness
Which definition best matches the use of the word contain in line 9?
A to hold or be capable of holding within a fixed limit or area
B to consist of; comprise
C to keep (one's feelings, behavior, etc.) within bounds
D to prevent (enemy forces) from operating beyond a certain level or area
O to prevent (enemy forces) from operating beyond a certain level or area