Given both θ and ϕ are acute angles and sinθ=1/2, cosϕ=1/3, then the value of θ+ϕ belongs to (200...

Given both θ and ϕ are acute angles and sinθ=1/2, cosϕ=1/3, then the value of θ+ϕ belongs to
(2004, 1M)
(a) (π/3, π/6]
(b) (π/2, 2 π/3)
(c) (2 π/3, 5 π/6]
(d) (5 π/6, π]

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