I need help with question number 9. Please indicate the correct answer, and it's regarding Canadian Business Law in Alberta.

Fox had wanted a drum kit for a long time. Although he was a minor, his mom gave him $300 and he took this with some savings and made a $500 down payment on a $3,500 drum kit, which was delivered to his house the next day. The balance was to be paid over a three-year period. His mom went into the store and signed the contract as a guarantor. Fox made the first three payments, but he lost interest, and quit making his payments, then the drum kit was ruined when his basement flooded. On these facts, which of the following are true? 1) In Alberta, Fox's mother will be liable on the guarantee because she is an adult and it is signed, and these are the requirements for a guarantee. 2) If Fox's mother's guarantee is valid, she would be liable on her guarantee even if the contract with Fox is voidable. 3) Even if the contract with Fox is voidable, he will have to pay because the drum kit has been destroyed. 4) The contract with Fox is voidable by Fox because he is a minor and minors can't enter into valid contracts. 5) To determine if the contract with Fox is voidable, we have to know whether he was going to use the kit for fun, or whether he needed it, perhaps for school or work. 6) The contract with Fox is voidable by the vendor, and if the vendor ends the contract, Fox has no contractual rights in this situation. 7) Fox's mother is not vicariously liable for contracts Fox enters into. 8) Fox's mother is vicariously liable for contracts Fox enters into