WXC Incurred the Following Costs During 2015 to Purchase LXT

WXC incurred the following costs during 2015 to purchase LXT shares: (a) 1,000 shares of LXT at $6 per share: $\begin{array}{lll}\text {January 1 payment. }&\$2,000\\\text {March 1 payment. }&1,000\\\text {May 1 payment.}&1,000\\\text {July 1 payment. }&1,000\\\text {September 1 payment. }&1,000\\\text {(b) Interest paid. }&400\\\text { (c) Brokerage fee paid.}&600\\\text {(d) Excise tax paid. }&300\\\end{array}$ Assuming the cost method is used,WXC should record this 2015 investment at:

A) $6,000
B) $6,600
C) $6,900
D) $7,300