Part A People who are free to think are free to act.
This poem has a hopeful tone. The title itself is positive talking about the mind being without fear. It talks wanting the author's country to awake "into ever-widening thought an action". This eliminates any answer that would be negative such as thoughts are dangerous and there is a price to pay. The author wants people's free thoughts to lead them into action but does not say that actions are louder.
Part B "Where tireless striving stretches its arms towards perfection;" he uses personification to explain how the freedom to think leads to action.
This is the only answer that best fits the theme from Part A. The other answers can be seen as correct explanations of the chosen quotes, but they do not all support the idea that free thought is good and leads to action.