Final answer:
In John's gospel, the phrase 'do this' in memory of refers to participating in a symbolic gesture, which is reenacted in the Christian ritual of Communion or the Eucharist
Step-by-step explanation:
In John's gospel, the phrase 'do this' in memory of refers to participating in a symbolic gesture. This can be seen in the context of the Last Supper, where Jesus instructs his disciples to partake in the bread and wine, symbolizing his body and blood.
This symbolic act is reenacted in the Christian ritual of Communion or the Eucharist, where believers partake in bread and wine to remember Jesus' sacrifice.
Therefore, option b. Reenacting a symbolic gesture is the correct answer.