Questions 21 and 22 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions.
We learn from the news that ______

A．three suspects were arrested by Hamas security forces
B．one of the suspects killed one of the other two, injured one, and killed himself at last
C．the Hamas security forces threw a grenade at three suspects
D．one of the suspects was killed by Hamas security forces