Who assisted Ummi's husband with Ummi's admission?

I can't verify this one from the question alone, because it's a reading comprehension item that depends on a passage, and the passage wasn't included in your message. The names Mallam Salihu, Salim, Kabir and Samuel only mean something in relation to the text. I don't have it, so I can't work out the answer independently.

What I can tell you

I can't confirm that from the passage, so please check it against the text yourself using the steps below.

How to solve this type of question yourself

1. Identify the key event. The question is about Ummi's admission, which probably means admission to a hospital (or possibly a school). Look for that part of the passage.
2. Find who helped the husband. Scan for the sentence where Ummi's husband is described getting help. Look for words like helped, assisted, took her to, arranged, or rushed.
3. Watch for distractors. JAMB often includes names that appear in the passage but do different things. For example, one person may be the doctor, one a neighbour, and one a relative. Match the name to the action of assisting with the admission, not just to being mentioned.
4. Confirm with the exact line. Before you choose, find the sentence in the passage that supports your answer.

Exam tip: In comprehension questions, read the question first, then read the passage while hunting for the answer. Underline the names as you go so you can quickly tell who did what.

If you paste the passage here, I can go through it with you and confirm whether Samuel is really the right answer.