MHT CET Physics question

A closely wound solenoid 80 cm long has 5 layers of windings of 400 turns each. The diameter of the solenoid is 1.8 cm. If the current carried is 8.0 A, estimate the magnitude of B inside the solenoid near its centre.

• (A) T, opposite to the axis of solenoid
• (B) T, along the axis of solenoidCorrect
• (C) T, along the axis of solenoid
• (D) T, opposite to the axis of solenoid