Rachel holds $110$ shares of Argon Mutual Fund. She is planning to sell $90$ shares. Her record of the share purchases is noted below. What could be her basis for the $90$ shares to be sold for purposes of determining gain?

Purchase April $1,2019$

Reinvested Dividends April $1,2020$

$\backslash$table$[[$Cost per Share,No$.$ of Shares$],[$$$100,100],[$$$150,10]]$

A$.$ $$9,500$

B$.$ $$9,409$

C$.$ $$9,000$

D$.$ Any of the above could be used as basis for the $90$ shares sold.