Step 1: Identify the sentence type.
Two simple sentences are given. To make a complex sentence, we join them using a relative clause (with “which/that”).
Step 2: Apply the rule.
- Sentence 1: “My mother keeps her ornaments in a safe.”
- Sentence 2: “This is the safe.”
- Combine → “My mother keeps her ornaments in the safe which is here.”
Step 3: Conclusion.
Hence, the correct complex sentence is: {My mother keeps her ornaments in the safe which is here.}