Cameras that automatically focus using phase detection have been around since the 1970s. however, these early auto-focusing cameras were slow and easily confused by low light and low contrast. in the 1980s, japanese manufacturers introduced automatically focusing cameras that remedied these problems, and now professional 35 mm cameras have the ability to automatically focus and to quickly determine which of several possible subjects needs to be most in focus.

which of the following statements can be inferred given the information above?

(a) automatic focusing in today's professional 35 mm cameras does not use phase detection.

(b) in the 1980s, some camera manufacturers produced cameras that focused faster than some of the cameras manufactured in the 1970s.

(c) cameras produced in the 1970s could not determine which of several possible subjects most needed to be in focus.

(d) today's professional 35 mm cameras that focus automatically are never confused by low light or low contrast.

(e) if a subject is in insufficient light, a camera built today that focuses automatically will generally take a clearer picture of the subject than one that doesn't focus automatically .