A thin air film is formed by putting the convex surface of a plane-convex lens over a plane glass plate

This question has a paragraph followed by two statements, Statement I and Statement II. Of the given four alternatives after the statements, choose the one that describes the statements.

A thin air film is formed by putting the convex surface of a plane-convex lens over a plane glass plate. With monochromatic light, this film gives an interference pattern due to light reflected from the top (convex) surface and the bottom (glass plate; surface of the film.

Statement I When light reflects from the air-glass plate interface, the reflected wave suffers a phase change of pi.

Statement II The centre of the interference pattern is dark.

(a) Statement I is true, Statement II is true; Statement II is the correct explanation of Statement I

(b) Statement I is true, Statement II is true; Statement II is not the correct explanation of Statement I

(c) Statement I is false, Statement II is true

(d) Statement I is true, Statement II is false