Directions : Which of the phrase/ word from the options (a), (b), (c) and (d) given below each sentence should replace the phrase printed in bold letters to make the sentence grammatically correct? If the sentence is correct as it is, mark (e) i.e., “No replacement required” as the answer.

Q:

He’s ten years old, but he still solves puzzles and calculates fuzzy logics with neurologists observing that he has lots of brain activities going on in his mind and all his vitals are extremely fascinating.

• 1
  yet he still solves puzzles
• 2
  but he still solves puzzles
• 3
  but still solves puzzles
• 4
  he still but solves puzzles
• 5
  No improvement