The correct option is E grasp
The word that fits in both the sentences is option E 'grasp'. 'Grasp' means to hold firmly. It also means to understand something. The context of sentence I is that his grasp of that subject is very good. The second sentence means that Vijay had firmly held the handle of the door. Option A 'make' means to build or construct. Option B 'power' means ability to do something. A and B do not fit in sentence I and II. Option C 'pull' means to drag . Option D 'seizure' means capture or take over. These two options D and E do not fit in sentence I. So, the best fit for both the sentences as replacement of the italicized words is Option E 'grasp'.