When a Direct Speech contains an idiom or phrase, there should be no change in tense while transforming it into Indirect Speech.
For example:
The minister said, "The mice will play when the cat is away." (Direct Speech)
The minister said that the mice will play when the cat is away. (Indirect Speech)
The given sentence in direct speech is in present indefinite tense. So, the sentence in indirect speech should also be in present indefinite tense. Reporting verb will remain in same tense as the direct speech.
Therefore, the correct answer is (b): He said that two and two make four.
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