单选题 A company does research about cash flow statements and gathers the following transactions in 2011:

Purchased securities held for trading	$3000
Purchased property, plant, and equipment	$4500
Proceeds from sale of plant	$3500
Losses on sale of plant	$1500

Based on this information, the net cash flow from investing activity in 2011 is closest to:
A. -$4000
B. -$2500
C. -$1000