The on balance volume (obv) indicatora) indicates a market bottom when prices and volume are both falling.b) is optimistic when prices are rising on low volume.c) is optimistic when prices are rising on high volume.d) is neutral whenever prices and volume move in opposite directions.

C) is optimistic when prices are rising on high volume.

Explanation:

The OBV indicator uses volume flow to predict changes in stock prices. According to Joseph Granville, the developer of this indicator, a sharp increase in volume without a significant change in the stock's price will cause the price to eventually jump upward or fall downward.