Calculate the growth rate of the following stream of cash flows:

YEAR CASH FLOW

$2023$ R $34600$

$2022$ R $31000$

$2021$ R $11900$

$2020$ R $10000$

a$.$

$26\%$

b$.$

$51\%$

c$.$

$43\%$

d$.$

$23\%$