Answer:D.They have failed in one or more of these areas: Bible reading, prayer, worshiping, and witnessing.
Explanation:
When people accept salvation they embark on a journey in which they want to pursue an understanding of what they have accepted.
For some when they read the Bible they find it contradicting and they can not piece the information together and that create some hesitation on whether they can understand salvation of not and for someone they just find it hard to even read it because all the time they do they just can't relate.
For some they have prayed for years but they haven't witness any signs of their prayers being answered and as result they feel like they can not witness for salvation if their prayers seem to have failed . They start to feel like the whole salvationn process has failed them.
All in all for some individuals there is always a struggle to keep up with prayers, worship and reading Bible , it may be too overwhelming to live a life that must commit to all these areas.