The question asks for the minimum attempts it would take to turn all 10 coins showing "H" to "T" with the rule that exactly 4 coins must be flipped at once.

Option 1 suggests that it would take 4 attempts. Although logically this could be seen as one attempt per four coins, this would only change 8 coins to show "T", leaving 2 coins still showing "H".

Option 2 suggests it would take 7 attempts. This doesn`t align with the rule of flipping exactly 4 coins at once as it would imply flipping less than 4 coins in some attempts.

Option 3, suggesting 8 attempts, suffers from the same issue as option 2, where more attempts have been made than divisible by 4.

Option 4 claims it is not possible to flip all coins to "T".

Alert - the correct answer should be Option 4, `Not possible`. Based on the given conditions, it`s impossible to have all the coins show “T”, since any attempt will always leave an even number of `H` coins, making the goal unattainable.