Measure of two quantities along with the precision of respective

measuring instrument is
A = 2.5 m s–1 ± 0.5 m s–1
B = 0.10 s ± 0.01 s
The value of A B will be
(a) (0.25 ± 0.08) m
(b) (0.25 ± 0.5) m
(c) (0.25 ± 0.05) m
(d) (0.25 ± 0.135) m

please tell me the correct answer and explain how to solve it