Answer:
A and B are perfect responses.
Step-by-step explanation:
B. Present Progressive
The present progressive tense is typically used to talk about something that is happening right now. It can also be used to talk about a future action or an action that is occurring at the same time as another one. It is formed by using a present tense form of the verb to be plus the present participle of the main verb.
I am walking to school right now. (current action)
He is walking to school tomorrow. (future action)
Most days we are walking to school when you see us. (simultaneous actions: are walking and see)
A. Perfect Tenses
Perfect tenses show when an action happened in relation to another action. To form the perfect tenses, use a form of the helping verb have (have, has, had, will have) plus the past participle of the main verb. The verb have changes to show the tense.