Mathematics i hope you help me with this

B.  

Explanation:

The coefficients tacked onto the trig functions tell us how vertically stretched the curves are. The dashed curve, representing , is taller than the solid curve. Therefore must be larger than

For the sine curve, note how it is increasing after we pass through t = 0. This indicates we have as a positive number. The value of is positive because the point (0,k) on the cosine curve has k being positive.