Just by acc and velocity of a particle at an instant , we can never exactly judge what type of motion it will be performing , because suppose a body was moving with const velocity and then suddenly a force acted and now it’s accelerating, so just by seeing acc = 0 at initial stage we can’t say that it will continue uniform motion
But , in these type of questions all you have to do is neglect such possibility and just observe what type of motion it is having in the given time’s neighbourhood assuming no other force will act even after
So here a and v are perpendicular and it seems like a uniform circular motion , but now you might think that it can happen that at this inst only tangentially acc was zero and further it might increase, so for that we need ext force and as i already mentioned assume that no ext force will act even after the situation and answer accordingly
So uniform circular motion should be the correct answer
Thanks @Shwetanshu_2018 bro.