Aresearcher who selects a sample of people of varying ages and studies them at one point in time is, by definition, using the method.
a. longitudinal
b. correlational
c. cross-sectional
d. biographical study

c. cross-sectional

Correct, by definition the cross sectional study "is a type of observational study that analyzes data from a population, or a representative subset, at a specific point in time" so for this case satisfy the condition required.

Explanation:

a. longitudinal

False a longitudinal study by definition is "is a research design that consists on taking repeated observations of the same variables over short or long periods of time" and usually with the same individuals, and that's not the case since we are selecting people at some point of the time.

b. correlational

False a correlational study is in order to check if two or more variables present correlation but this study not take in count the time so for this case is not the correct option

c. cross-sectional

Correct, by definition the cross sectional study "is a type of observational study that analyzes data from a population, or a representative subset, at a specific point in time" so for this case satisfy the condition required.

d. biographical study

False this study is not related to the question of interest.

the correct answer is "hematoma formation, with ligaments that are stretched, partially, of fully torn" ankle sprain are produced by an injury to the tough bands of tissue (ligaments) that surround and connect the bones of the leg to the foot. this causes several damage to the ankle including hematoma formation and ligament injury .

i would think yes.

explanation:

because we have every natianlity in our country which makes us so diverse and unique. that's why in a lot of cities there are places like little italy, koreatown, chinatown.