Final answer:
The correct word to fill in the blank is 'while', which creates a contrast between the student's dislike for football and their brother's talent in playing it. The personal anecdote of football experience further underscores this contrast.
Step-by-step explanation:
The correct choice to complete the sentence is option 3) while. Therefore, the completed sentence would be: I do not like football, while my brother can play football very well. This contrast shows that even though you do not enjoy football, your brother has a talent for the sport.
Your experience with football, as someone who played from ages 7-12 and was coached by your dad, clearly shows that you had a personal connection to the sport and found joy in it. It's interesting to note the contrasting abilities between you and your brother, where he was brave enough to play with older kids and you preferred to avoid tackles at his age. Both of you were involved in football, but it seems that your brother truly shined even at a younger age.