Final answer:
The correct adjective to fill in the blank for a drink flavored with caramel or peppermint bark is 'sweeter'. These flavors increase the sweetness of a drink without making it bitter, stronger, or weaker.
Step-by-step explanation:
The question asks to fill in the blank with the appropriate adjective when referring to drinks flavored with either caramel or peppermint bark.
The correct answer to 'Drinks get ________ if it is solely Caramel or Peppermint Bark.' is sweeter.
Caramel and peppermint bark are both sweet flavors, and when they are added to drinks, they generally increase the sweetness of the beverage.
No bitterness or change in strength is implied by adding these flavors, and 'weaker' would typically refer to the dilution of flavor or potency, which is not the effect of adding sweeteners.