By David McDonnell Marcus Rashford has hit back at those who have questioned his commitment and desire to play for Manchester United. Rashford has endured a difficult season since signing a lucrative new contract last summer on the back of a career-best 30-goal haul last year. The England striker has scored just five goals this season and has fallen foul of United boss Erik ten Hag, most recently following a boozy bender in Belfast, after which he missed training, claiming to be unwell. The 26-year-old has been accused of failing to put in the required work-rate for United during games, but ha…