Dilute hydrochloric acid is gradually added to a solution that is buffered at pH 4.76. How will the pH of the solution be affected?

What are the choices?

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts