Which of the following most clearly explains why Roger deliberately throws rocks near but not at Henry?
"They fell about him with a series of hard thumps and he was not touched. Roger did not consider his escape, but looked from the nuts to Henry and back again."
"At last he saw one and laughed, looking for the friend who was teasing him. But Roger had whipped behind the palm again, was leaning against it breathing quickly, his eyelids fluttering. Then Henry lost interest in stones and wandered off."
"Here, invisible yet strong, was the taboo of the old life. Round the squatting child was the protection of parents and school and policemen and the law. Roger's arm was conditioned by a civilization that knew nothing of him and was in ruins."
"Roger gathered a handful of stones and began to throw them. Yet there was a space round Henry, perhaps six yards in diameter, into which he dare not throw."
"Roger stooped, picked up a stone, aimed, and threw it at Henry - threw it to miss. The stone, that token of preposterous time, bounced five yards to Henry's right and fell in the water."