Business activity in the euro zone hit a 46-month high in March, according to data released on Tuesday, bolstering hopes that growth in the region is becoming more entrenched.

Flash euro zone composite Purchasing Manager's Index (PMI) data from Markit came in at 54.1 in March, up from 53.3 in February, marking the fastest growth in almost four years. The composite reading measures both manufacturing and services activity, with the 50-point mark separating contraction from expansion.