Réponse:
a) la recherche : research
Améliorer: improve
Particulièrement : especially
Bénéfices: benefits
Perturbation / indisciplines : disruptions
Placard : cupboard
b) This text is about benefits of eating breakfast.
c) When you don't have a breakfast, you feel tired, it's difficult for you to remember things for a test, you don't have enough energy to work...