Step 1: Option (A) uses “they who,” which is incorrect because “they” cannot function as the subject of a relative clause in this context.
Step 2: Option (B) uses “them who,” which is grammatically incorrect because “them” is an object pronoun and cannot precede “who.”
Step 3: Option (C) uses “he who,” which is grammatically correct in some contexts, but here it refers to a plural subject (“those”), so it is inappropriate.
Step 4: Option (E) uses “that who,” which is ungrammatical.
Step 5: Option (D) is correct because “those who” properly introduces a plural antecedent with a relative clause. It matches the meaning and structure of the sentence naturally.
Final Answer: Option (D) is the grammatically correct sentence.