The correct option is B as strong as
The given sentence is in the positive degree of comparison because they begin with the words 'No other'. As we have studied, sentences that begin with 'no other' are usually positive degree sentences, sentences with 'more... than any other' are comparative, and those with 'the best/most...of all' are superlative.
Option C: 'As strong as' is in the positive degree. It agrees with the sentence, that 'no other team is as strong as our team'. Hence option C is correct.
Option A: 'Stronger' is a comparative adjective, and it requires the linking word 'than', which is used in comparative sentences. Hence option A is incorrect.
Option B: 'Strongest than' is not the correct form. 'Strongest' is a superlative whereas 'than' refers to the comparative. Hence option B is incorrect.
Option D is incorrect because the answer lies in C.