Answer:
Beat ( B )
Step-by-step explanation:
The beat is the basic unit of time and pulse which is of a mensurable level and in music is very important for a piece of music to have a beat because that is the soul ( the heart ) of the piece of music. while the rhythm is seen as the actual sound or time value of the notes in the music been played and listened to.
while meter is the regular reoccurence of bars and beats. it is usually not sounded out like with the rhythm found in musical piece when the music is playing though they are expected to be part of the music by the listener and contributes in making a musical piece entertaining when been listened to.