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"85. Let \\( N = \\sin ^ { 2 } \\alpha + \\cos \\left( \\frac { \\pi } { 3 } - \\alpha \\right) \\cdot \\cos \\left( \\frac { \\pi } { 3 } + \\alpha \\right) \\) then \\( \\log _ { 2 } \\mathrm { N } \\) is:\n\\( \\begin{array} { l l l l } { \\text { (A) } 1 / 2 } & { \\text { (B) } - 2 } & { \\text { (C) } - 1 / 2 } & { \\text { (D) } 2 } \\end{array} \\)"

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