Select the correct direct form of the given sentence.

The doctor said that they had performed their bit.

The doctor said, "We have performed our bit." 

The correct direct form of the given sentence is:

The doctor said, "We have performed our bit."

This is because the direct form of a sentence is the exact words that someone spoke. In the direct form, the subject and tense of the verb do not change.

The other options are incorrect because they change the direct form of the sentence in some way:

• The doctor said, "We performed our bit." - This sentence changes the tense of the main verb from "have performed" to "performed."
• The doctor said, "We are performing our bit." - This sentence changes the tense of the main verb from "have performed" to "are performing."
• The doctor says, "We had performed our bit." - This sentence changes the reporting verb from "said" to "says."