Mortgage rates continued to rise last week, causing more borrowers to head to adjustable-rate loans, which are cheaper but considered riskier.

Mortgage rates continued to rise last week, causing more borrowers to head to adjustable-rate loans, which are cheaper but considered riskier.

The average long-term US mortgage rate climbed this week to its highest level in nearly nine months, raising borrowing costs for homebuyers during what is traditionally the…