Do experience or material goods make us happier, central idea

                                                                                                               New studies have provided compelling evidence that there is real value in some kinds of material purchases. In a study that was published in Psychological Science in April, researchers found that people were happier if they spent on things that matched their personality.

the answer is b. the tomb is underground and dark, and its opening is covered by a heavy grate.

what are the main ideas?