The upper part of the given graph is a hypothetical movement in the BSE Sensex over a few

The upper part of the given graph is a hypothetical movement in the BSE Sensex over a few months and the lower part is the fluctuation in the average value of automobile shares in the same period (actual values not given). 

Which one of the following inferences can be drawn from the graphs?  

(a) The automobile share market has been as unstable as BSE Sensex in that period 

(b) There has been a major political change in June/ July 

(c) Automobile shares have shown a steady improvement in price, unaffected by large fluctuations in BSE Sensex 

(d) None of these