Answer the questions after carefully reading the passage:

Being a memory trainer, I meet hundreds of people from different professions and lifestyles who are constantly complaining about memory problem. Some people complain that they have a very bad memory and are not able to remember anything while others say that they face a problem recalling phone numbers but are good at recalling names and faces. And then there are those who remember phone numbers, but cannot remember the names of the people they wish to call. Some people are fast at memorizing things but cannot retain it for long whereas there are a few others who though take a long time to memorize but can retain that information for a long time. They often ask me to give them some tips on how they can improve their poor memory.

Let me first tell you that there is no such thing as a poor memory. This may come as a shock to those of you who have used your supposedly 'poor' memory as an excuse for years. But, I repeat, there is no such thing as a poor memory. There is only trained or untrained memory. Trained memory means that we can learn to remember things in a simple and definite way just as we have learnt to speak, walk, and eat. With the use of some smart memory techniques, we can remember much more information for any given length of time, and all this in a very systematic way. The good news is that by training our memory, we all can have a very good, quick, and retentive memory for almost anything.

How to remember more information for a long time?

Processing information in a systematic way.

The correct answer is Option (4) → Processing information in a systematic way.

Explanation:
In the passage, the author mentions that trained memory means learning to remember things in a simple and definite way, similar to how we learn other skills like speaking, walking, and eating. The author also emphasizes the use of smart memory techniques to remember more information for any given length of time. This suggests that processing information in a systematic way, using memory techniques, can help in retaining information for a long time. Therefore, the most appropriate answer is "Processing information in a systematic way."