Everything indicates that, since we have a balanced system, the power is equal on all the loads.

Yet, some operations DO lead to the results on alternative A:

`P=380²/10<60 = 1440<-60`

As  `cos-60=0.5` then `P=1440*0.5 = 7220`

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The theory:

It is known that the sum of the two wattmeters is the total power of the load, but it doesn't mean that both of them will present the same value, since the **SOURCES** are **out of phase**

Found a document with an exercise. Refer to example 20.1

https://nptel.ac.in/content/storage2/courses/108105053/pdf/L-20(NKD)(ET)%20((EE)NPTEL).pdf