Answer:
The voltage across both resistors is the same: 6 V (your option A)
Step-by-step explanation:
Please look at the attached image that shows you the two equal resistors connected in parallel to a voltage supply of 6 V.
Notice that in this type of connection, both resistors are subjected to the same potential difference generated by the power supply. Therefore, both resistors see the same voltage across their ends: that of the power supply (6 Volts)