Movement into and out of cells — practice question

Which statement describes how mass flow develops in sieve tube elements?

• ASucrose actively loaded into sieve tube elements decreases the water potential causing the hydrostatic pressure to increase.
• BSucrose actively loaded into sieve tube elements increases the water potential causing the hydrostatic pressure to decrease.
• CSucrose diffused into sieve tube elements decreases the water potential causing the hydrostatic pressure to increase.
• DSucrose diffused into sieve tube elements increases the water potential causing the hydrostatic pressure to decrease.