A) The areas where the word of God specifically aids young Timothy include doctrine, reproof, correction, and instructions in righteousness. Doctrines establish the essential truths. Reproof differs slightly from rebuke; it's a gentle rebuke. Corrections help people to discern right from wrong. Instructions in righteousness help people understand the most applicable and effective applications of the word. 

B) The verse concludes that the man of God may be complete, thoroughly equipped for every good work. To be complete means to be mature, to possess the necessary elements to accomplish the task. Being fully equipped for every good work implies that the word of God equips us to respond and engage in everything we encounter. As the word of God is penned by the Holy Spirit, it's crucial to understand that the effectiveness of God's word in our lives comes from its application through the power of the Holy Spirit.