Final answer:
The grammatically correct option for the survival of germs on hands is option (b), stating that germs can survive from a few hours to a few days.
Step-by-step explanation:
The corrected grammar for the sentence about the survival of germs on hands is: "Germs can survive on your hands anywhere between a few hours to a few days." This implies that the phrase should include an indefinite article 'a' before 'few' to suggest a non-specific quantity of hours or days, and that 'from' is not necessary before 'anywhere.' Therefore, option (b) is the correct grammar: "Germs can survive on your hands from anywhere between a few hours to a few days."