Answer:
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Initial speed of walking = 1 m/s
Final speed of walking = 3 m/s
Change of speed in walking = (3 - 1) m/s
= 2 m/s
Time in which the change of speed occurred = 1 sec
Then
Acceleration = Change of Speed/ Time taken
= 2/1 m/s^2
= 2 m/s^2
So the correct option among all the options that are given in the question is option "A". I hope the procedure for finding the acceleration is clear to you and in future you can attempt such problems on your own and will required no help from outside.
90.3895 would be the answer if you convert it to pounds