Catholics may partake of communion during Protestant services as a demonstration of Christian unity.
The best answer is: False
CCC #1400 “Ecclesial communities derived from the Reformation and separated from the Catholic Church, "have not preserved the proper reality of the Eucharistic mystery in its fullness, especially because of the absence of the sacrament of Holy Orders." It is for this reason that, for the Catholic Church, Eucharistic intercommunion with these communities is not possible. . .”