The adverbs such as “extremely”, “too” and gently are going to depict the use of word tha modifies verb.
In the above case, the patient is “too cold” that means he is extremely cold, therefore he asked for another blanket. The word “too” is an adverb.
Thus, the options (d), (b) and (a) are incorrect.
In the above case, the patient is “too cold” that means he is extremely cold, therefore he asked for another blanket. The word “too” is an adverb.
Therefore, the correct option is – a. too.