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Asserton (A) : If a gt 0, then range ...

Asserton (A) : If a `gt` 0, then range of d+ a cos (x+ bx) is [d-=a,d+a]
Reason (R ) : The period of d+ a cos ( x+ hx ) is `(2pi)/( 1+b)` Then which one of the following is correct ?

A

A is true R is true and R is correct explanation of A

B

A is true R is true and R is not correct explanatin of A

C

A is true R is false

D

A is false R is true .

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