The lack of is a central problem in malnourishment.
a. fats
b. protein
c. water
d. sugar

The lack of PROTEIN is a central problem in mal-nourishment.    

Malnutrition is the lack of proper nutrition in people when they do not have proper nutritious and enough food to eat. Lack of proper nutrients in the body causes malnutrition. Its symptoms are fatigue, dizziness, and weight loss etc.          

the answer is admiramos

the rule for verbs is whoever you are referring to (in this case 'nosotros'), you need to change the ending of the word.

nosotros - amos

yo - o

tu - as

el, ella, usted - a

ellos, ellas, ustedes - an

(examples: nosotros bailamos (instead of bailar) or yo hablo (instead of habla)