I actually think "where" is better. But none of them are needed. When a relative pronoun is not the subject of a relative clause, it can usually be omitted.
Hello. I was hoping someone could help with this question.
This is a place _______ people can easily reach to find refreshment.
1. in which 2. what 3. where 4. which
The book says that the correct answer is 4. which. However, I feel 3. where, is a possible correct answer.
Would anyone be able to help me with why 'where' shouldn't be used in this example?