Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: The price of first class stamps could be capped by the postal watchdog, it was announced yesterday. Royal Mail could be made to fix or even slash the amount it charges for delivering post as part of a wide-ranging inquiry by regulator Ofcom. The newly-privatised firm has been accused by MPs of taking the ‘easy option’ by increasing stamp prices to boost profits rather than improving its service and efficiency. In March, first and second class stamps rose by a penny to 63p and 54p respectively, sparking claims that the public was being forced to prop up flagging letters revenue.Ofcom announced a 'fundamental review' into the Royal Mail on TuesdayPostal watchdog is looking into whether the price of stamps should be setIn March price of first and second class stamps rose by a penny eachSecond class prices already capped at rate of inflation by first class aren't 
 Question:_ has a legal obligation to deliver letters to every home six days a week, including the remotest areas, for the same price - known as the universal service.

Royal Mail