A.99

B.A compilation error occurs in the main method.

C.A compilation error occurs in the modify method.

D.5

A.13

B.11

C.12

D.10

A.[jasmine, lily, lotus]

B.[jasmine, rose, lily]

C.[jasmine, rose, lotus, lily]

D.A runtime exception is thrown.

A.The program executes indefinitely.

B.num = 100

C.num = 99

D.num = 0

A.m.writeMsg();

B.Messenger.writeMsg();

C.void writeMsg();

D.writeMsg();