Which sentence corrects the vague pronoun problem in this sentence?
O I'd like to study either one, but it will be difficult.
I'd like to study biology or math, but they will be
difficult.
O I'd like to study them, but making a choice between
the two will be difficult.
O I'd like to study biology or math, but choosing
between the two will be difficult.

Which words in this excerpt from the count of monte cristo can be used as synonyms to determine the meaning of the word grotto? dant? s entered the second grotto. the second grotto was lower and more gloomy than the first; the air that could only enter by the newly formed opening had the mephitic smell dant? s was surprised not to find in the outer cavern. he waited in order to allow pure air to displace the foul atmosphere, and then went on. 1. air 2. opening 3. mephitic 4. cavern 5. pure 6. atmosphere