Correct option is D
The correct option is (d) We have been playing since 4 o’clock.
The sentence means that the activity of playing started at 4 o’clock and is still continuing. The preposition "since" is used to indicate the starting point of an action in the past, and it is appropriate to use it in this sentence to convey the intended meaning.
Option (a) is incorrect because "for" is used to indicate a duration of time, not a starting point.
Option (b) is incorrect because "from" indicates the starting point of an activity, but it is not appropriate in this sentence because it does not convey the ongoing nature of the activity.
Option (c) is incorrect because "to" is used to indicate an endpoint, not a starting point, and it does not convey the ongoing nature of the activity.