11. One of the challenges of tidal wave energy is: A. the start up costs are expensive
B. as global warming increases, the tides will diminish
C. the materials needed to couple the tidal energy to electricity are rare
D. the tides are very unpredictable

Which statement does lola need to correct, and why? a) statement 1 because spiral galaxies do not havearmsb) statement 2 because the bulges contain mostlyyoung red stars.c) statement 3 because the arms are made of mostlyyoung blue and blue-white stars.d) statement 4 because spirals galaxies contain littleto no dust.(c)