Four light waves are represented by (i) y = a1 sinw t (ii) \[y={{a}_{2}}\sin (\omega \,t+\varphi )\] (iii) \[y={{a}_{1}}\sin 2\omega \,t\] (iv) \[y={{a}_{2}}\sin 2(\,\omega \,t+\varphi )\] Interference fringes may be observed due to superposition of

• A. (i) and (ii)
• B. (i) and (iii)
• C. (ii) and (iv)
• D. (iii) and (iv)