Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

Michael Bloomfield is a trader at 2Fast Trading, a proprietary trading company that uses machine learning and algorithms to execute trades. He works with Amy Riley, a junior trader at the company. Bloomfield and Riley meet to review the company’s trading systems and several trades in Bloomfield’s trading account.They discuss the increasing impact of market fragmentation on available liquidity for the company’s trading strategies. Riley makes the following comments regarding market fragmentation:Comment 1: Liquidity aggregation and smart order routing help traders manage the challenges and opportunities presented by fragmentation.Comment 2: With increasing market fragmentation, traders who fill large orders now search for liquidity across multiple venues and across time to control market impact.Bloomfield tells Riley that he noticed trades of 500 shares of BYYP stock were executed every 20 minutes for an hour. Bloomfield saw the same pattern of trading in the stock during the previous trading day. He instructs Riley to submit an order to purchase BYYP shares on the assumption that a trader seeks liquidity and is executing a large buy order by breaking it into pieces. The prices of these trades and the best bids and offers in the market when the BYYP trades occurred are presented in Exhibit 1.
| Exhibit 1 | BY YP Trade Details |
| Trade | Trade Price | Prevailing Bid | Prevailing Offer |
| 1 | 41.50 | 41.45 | 41.50 |
| 2 | 41.75 | 41.73 | 41.75 |


Bloomfield shifts the conversation to AXZ Corp. Bloomfield notes that AXZ’s bid–ask spread is narrow, even though AXZ’s share price has been experiencing a period of high volatility. After extensive research, Bloomfield will purchase AXZ shares using a trading strategy that does not include standing orders.Bloomfield then assesses the risks that 2Fast’s electronic trading strategies introduce into the market. He is concerned that these risks may bring on more regulation. Bloomfield claims that the risks can be reduced by changing the structure of the market, and those structural changes can maintain 2Fast’s primary competitive advantage, which is trading faster than competitors.Bloomfield mentions that a regulatory body is investigating a competitor’s trading practices. The investigation involves a tip that the competitor is manipulating markets by submitting orders and arranging trades to influence other traders’ perceptions of value. Specifically, regulators were informed that the competitor has been buying stock to raise its price, thereby encouraging momentum traders to buy, and then selling the stock to them at higher prices. The regulator confirmed that the competitor did not use standing limit orders or commonly controlled accounts for the trades under investigation.
Which structural change for the market associated with electronic trading systems is most consistent with Bloomfield’s claim?
Option A:Delaying order processing by random intervals.
Option B:Exchanges using trade halts when prices move too quickly.
Option C:Slowing markets by running call markets once a second or more often instead of trading continuously.

Answer: B