U.S. housing starts rose far less than expected in March and permits recorded their biggest drop since last May, which could raise concerns about the economy’s ability to bounce back from a soft patch hit in the first quarter. Groundbreaking increased 2.0 percent to a seasonally adjusted annual pace of 926,000 units, the Commerce Department said on Thursday. Starts for single-family homes rose, while groundbreaking for the multifamily segment fell last month.