The best response to the question regarding Grandpa Arnie's actions and his feelings for Axel is:
A He remembers the boy and shows him love.
This is supported by the fact that Grandpa Arnie acknowledges Axel's presence and recalls happy memories with him, expressing love and affection through his actions, such as trying to tickle Axel and pulling him close. Despite his memory loss, the warmth in his actions conveys his enduring love for Axel.