Step 1: Identify the tense and structure.
The main verb is “dijo” (he said), which is in the past tense. When the main clause is in the past, the subordinate clause often takes the imperfect subjunctive.
Step 2: Apply the sequence of tenses rule.
In reported speech or indirect discourse in Spanish, the verb following “que” should agree in time. The correct form of “llegar” in imperfect subjunctive is llegara (or llegase).
Hence:
Antonio dijo que llegara tarde a la reunión.
Step 3: Analysis of options.
- (1) haya llegado → present perfect subjunctive (used for present/past link, not correct here).
- (2) llegaría → conditional tense (would arrive), not matching indirect speech here.
- (3) llegara → correct; imperfect subjunctive fits after a past verb “dijo.”
- (4) llegando → gerund; incorrect in this structure.
Step 4: Conclusion.
The correct answer is llegara.