A.I. Explanation:

Option 1: "no participation"

Explanation: This option suggests a lack of involvement, which contradicts the context of the text that emphasizes trust in ordinary people participating in political movements. The text implies that there is an active engagement from the majority, making 'no participation' an incorrect choice.

Option 2: "full participation"

Explanation: While this option implies a high level of involvement, it does not accurately reflect the specific context of the text. The text focuses on the idea of trust in ordinary people rather than the extent of their participation, making 'full participation' too broad and not the best fit.

Option 3: "direct participation"

Explanation: This option aligns perfectly with the context of the text, which discusses trust in ordinary people who actively engage in political rallies and movements. The term 'direct participation' captures the essence of the involvement being discussed, as it emphasizes the active role of individuals in the political process.

Option 4: "simple participation"

Explanation: This option implies a basic level of involvement, which does not convey the active and engaged nature of the participation described in the text. The text suggests a more profound connection and trust in the actions of ordinary people, making 'simple participation' an inadequate choice.