Step 1: Recall the basic rule for modal auxiliaries. When a modal verb (such as may, might, can, or could) is used, it must be followed by the base form of the verb, not by a past or third-person form.
Step 2: Examine each option in light of this rule and overall usage:
- (A) — although the structure may appear grammatically possible, it suggests an unreal or less appropriate future meaning in this context, so it is not the best choice.
- (B) — correctly follows the pattern modal + base form of the verb, making it both grammatically correct and natural in usage.
- (C) — uses shall with a third-person subject, which is generally considered unnatural or overly formal in modern English.
- (D) — the phrase “might not came” is incorrect because a modal auxiliary cannot be followed by a past tense verb, violating the modal rule.
Step 3: Since only option (B) fully follows grammatical rules and sounds natural in modern English, it is the correct answer.