Task: Question Answering
Input (English): Passage: I went to my favorite local gas station . I had to insert a credit card to start the transaction . I tugged at the slot to make sure that there was not a skimming device on the pump .  I then inserted my credit card .  I filled up the tank with 87 octane gasoline because it was the least expensive . When I was finished , I twisted the gas cap back onto the tank and closed the access door . The screen on the pump asked if I wanted a paper receipt .  I selected " Yes , " and a paper receipt printed immediately .  After I grabbed the receipt , I made sure that the transaction was complete and the screen was at the start of a new transaction . Question: What are they doing to their car tank? Option1: Filling it with gas Option2: Draining it.
Output (English): Filling it with gas