A very <em>interesting </em>way to state that the character has bloomed/matured/grown. It's visible this character has grown physically/emotionally/mentally. And the author wants you to see that.
B) he spends a lot of time helping okonkwo with farming.
<em><u>Explanation:</u></em>
The statement portrays that Ikmefeuna became strong. He grew to be fearless and manly. With this words, the author implied that he invests a ton of energy helping Okonkwo with farming.