Need brief explanation about why D is the answer.

 Push factors encourage people to leave their points of origin and settle elsewhere, while pull factors attract migrants to new areas. For example, high unemployment is a common push factor, while an abundance of jobs is an effective pull factor.

Step-by-step explanation:

it will take 1.7 years

Step-by-step explanation:

APR  = 1.25%

Opening balance =X= $2,500

Total earned balance =Y=$7,500

Required time =Z

Therefore;

Y = X*APR*Z

Z = Y / (X*APR)

Z = 7500 / (2500*1.25%)

Z = 1.7 years