Read the following sentence. alayna has been playing with those blocks all day. what is the verb tense, and what is the meaning of the verb tense?

Apresent progressive expresses something that is happening right now.

Bpresent perfect progressive expresses something happened in the past and is still happening.

Cpresent expresses something that is happening in general.

Dpresent perfect expresses that an action happened at an unspecified time before now.