In this passage the words "innocent people" mean ______.

A．was the worst single attack in twenty years of conflict in Northern Ireland
B．was captured by a special reporter
C．is threatening to hold back the peace process
D．will destroy the peace process, according to Tony Blair's view

A．on Saturday when there were many people in the park
B．outside a shopping center on Saturday
C．in a car factory
D．in a big square where there were many people