Let the temperatures on Monday, Tuesday, Wednesday, and Thursday be $x^∘, y^∘, z^∘,$ and $w^∘C$ respectively.
Given that,
- $x+y+z = 3 \times 41$
- $y+z+w = 3\times 43$
Thursday temperature is $15\%$ higher than Monday temperature. So,
After solving above equations, we get $w=46$
Therefore, correct answer is (C).