The grammatically correct option is: The teachers will be able to visit our schools and compare our teaching methods with their own.
This sentence is structured properly and maintains parallelism. The important points that justify this choice are:
- Visit our schools: Correct plural form of "schools" aligns with the plural noun "teachers," suggesting multiple locations are being referenced.
- Compare our teaching methods with their own: The use of "compare...with" is grammatically precise, as the comparison is between two entities: their methods and those of the teachers.
In contrast, other options contain grammatical inaccuracies or lack clarity, such as incorrect preposition usage or mismatching subjects and objects.