Answer: B, C
2,4-Dinitrochlorobenzene reacts with aqueous NaOH at about 368 K and picryl chloride (2-chloro-1,3,5-trinitrobenzene) even at room temperature, because of the activating ortho/para NOX2 groups. Chlorobenzene needs 623 K and 300 atm, and the methyl group in 4-chlorotoluene is electron-donating, so it is also unreactive under mild conditions.