The chancellor is under severe pressure to make good on Labour's pledge to boost economic growth.It was never the plan for tomorrow’s Spring Statement to be such a major parliamentary occasion.Rachel Reeves has previously insisted that the autumn Budget, which takes place in October, would be the only fiscal event of the year.The Spring Statement, by contrast, was only meant to be an opportunity for the chancellor to give a relatively brief “update” on the state of the economy.But given how much the public finances have worsened in the past six months, the statement has taken on far greater significance than was originally intended.HuffPost UK looks at the chancellor’s options and what she is expected to announce.‘The World Has Changed’We can expect Reeves to blame international uncertainty for the fact that the state of the UK economy has worsened since the Budget.The Office for Budget Responsibility (OBR) is set to downgrade its forecast for economic growth this year from 2% to just 1%.This is a major blow