In a Certain Section of the Country,the Price of Chicken $3 \sqrt { x + 1 }$

Multiple Choice

In a certain section of the country,the price of chicken is currently $3 per kilogram.It is estimated that x weeks from now,the price will be increasing at a rate of $3 \sqrt { x + 1 }$ cents per kilogram.How much will chicken cost 4 weeks from now?

A) $4.20 per kilogram
B) $3.20 per kilogram
C) $2.21 per kilogram
D) $0.21 per kilogram