I suppose the underlined word is "fortitude". The word that most closely defines it would be strength. Fortitude means courage in a dangerous or adversary situation; endurance, resilience. This passage draws on the traditional, patriarchal prejudice of women as frail, weak creatures that have to rely on men for courage and strength.
I need the entire sentence for context before I can answer the question. All of these options could be a subject, but you need to give context.
The word <em>over </em>is used as an adverb in this sentence.
If the sentence said - There will be clouds over most of the country, then it would be a preposition.
