Select the correct indirect form of the given sentence.

“We had opened the lock.” they told me.

They told me that they had opened the lock.

The correct indirect form of the given sentence is:

They told me that they had opened the lock.

The other options are incorrect because they do not follow these rules:

• They said that we had opened the lock. - This sentence does not change the first person pronoun "we" to the third person pronoun "they."
• They said to me that they have opened the lock. - This sentence does not change the present tense to the past tense for the auxiliary verb "have."
• They says that we had opened the lock. - This sentence is grammatically incorrect.