To answer this question, we need to understand the correct verb form to use in the given sentence. The verb form should match the subject "you" and the tense of the sentence.
Option A) lock - This option is incorrect because it is in the base form of the verb and does not match the subject "you" or the tense of the sentence.
Option B) to lock - This option is correct because it is the infinitive form of the verb "lock" and matches the subject "you" in the sentence.
Option C) locking - This option is incorrect because it is the present participle form of the verb "lock" and does not match the subject "you" or the tense of the sentence.
Option D) having locked - This option is incorrect because it is the present perfect participle form of the verb "lock" and does not match the subject "you" or the tense of the sentence.
The correct answer is B) to lock. This option is correct because it matches the subject "you" and the tense of the sentence.