This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to remember anything
Don't multitask.
Concentration is incredibly important for retaining your memory. You need to keep things simple.

Options are: A. This is why you enter a room and forget why you came in. It's because you were probably planning your party at the same time, or thinking about the tv episode that you just watched and you weren't concentrating.; B. We don't want to seem to know every detail, and just like what you say we don't want to sound like a marathon. The trouble is we often find things unclear.; C. Try to do every single task as much as possible. Stress can lower your memory and make it harder to retain information.; D. For example, say you're making a salad. You're simply about to saute some celery in a pan.;
The answer is:
A.