Answer:
option A
Explanation:
given, 
the bank branch is offering $1,000 certificates of deposit.
Rate of interest per year = 4 % = 0.04 
The bank is selling certificates with terms of 1, 2, 3, or 4 years
total amount = A , in dollar 
time of investment = k years 
4 k% is added to the original deposit.
A = P + P r t 
A = P (1 + r t) 
A = P (1 + 0.04 k) 
the correct answer is option A