Situational irony!
Because, she initially thought she was free from her husbands wrath. She celebrated and her heart was happy, this only to end with such a heartbreak that it kills her.
B because it talks about expressing individuality.
Nature is raw and tangible, which often helps characters find who they really are when they are lost in the wilds.
Examples:
-siddhartha: the ferry man found that the river was an allegory for life
-where the red fern grows: billy found his true belonging (of being a leader) when he was outside in nature with his dogs
A) Is not always directly stated.
Sometimes the main idea is implied instead of directly stated. You can also get the main idea from the Theme which is stated at the end of the first paragraph.
i hope i helped:)