Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
USS Bancroft (DD-256)
Table title:
Trans-Atlantic convoys escorted
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Convoy </th><th colspan=1 rowspan=1 > Escort Group </th><th colspan=1 rowspan=1 > Dates </th><th colspan=1 rowspan=1 > Notes </th></tr>
<tr> <td colspan=1 rowspan=1 > SC 49 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 14-21 Oct 1941 </td><td colspan=1 rowspan=1 > Newfoundland to Iceland </td></tr>
<tr> <td colspan=1 rowspan=1 > SC 55 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 19-25 Nov 1941 </td><td colspan=1 rowspan=1 > Newfoundland to Iceland </td></tr>
<tr> <td colspan=1 rowspan=1 > SC 71 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 27 Feb-9 March 1942 </td><td colspan=1 rowspan=1 > Newfoundland to Northern Ireland </td></tr>
<tr> <td colspan=1 rowspan=1 > ON 76 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 16–23 March 1942 </td><td colspan=1 rowspan=1 > Northern Ireland to Newfoundland </td></tr>
<tr> <td colspan=1 rowspan=1 > SC 78 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 9–16 April 1942 </td><td colspan=1 rowspan=1 > Newfoundland to Northern Ireland </td></tr>
<tr> <td colspan=1 rowspan=1 > ON 90 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 5–9 May 1942 </td><td colspan=1 rowspan=1 > Northern Ireland to Newfoundland </td></tr>
<tr> <td colspan=1 rowspan=1 > SC 85 </td><td colspan=1 rowspan=1 > MOEF group C4 </td><td colspan=1 rowspan=1 > 31 May-12 June 1942 </td><td colspan=1 rowspan=1 > Newfoundland to Northern Ireland </td></tr>
<tr> <td colspan=1 rowspan=1 > ON 105 </td><td colspan=1 rowspan=1 > MOEF group C4 </td><td colspan=1 rowspan=1 > 20–27 June 1942 </td><td colspan=1 rowspan=1 > Northern Ireland to Newfoundland </td></tr>
<tr> <td colspan=1 rowspan=1 > HX 197 </td><td colspan=1 rowspan=1 > MOEF group C4 </td><td colspan=1 rowspan=1 > 9–16 July 1942 </td><td colspan=1 rowspan=1 > Newfoundland to Northern Ireland </td></tr>
<tr> <td colspan=1 rowspan=1 > ON 116 </td><td colspan=1 rowspan=1 > MOEF group C4 </td><td colspan=1 rowspan=1 > 26 July-1 Aug 1942 </td><td colspan=1 rowspan=1 > Northern Ireland to Newfoundland </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > ON 121 </td><td class="highlighted"  colspan=1 rowspan=1 > MOEF group C3 </td><td colspan=1 rowspan=1 > 20-22 Aug 1942 </td><td colspan=1 rowspan=1 > Iceland to Newfoundland </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > SC 99 </td><td class="highlighted"  colspan=1 rowspan=1 > MOEF group C1 </td><td colspan=1 rowspan=1 > 9-19 Sept 1942 </td><td colspan=1 rowspan=1 > Newfoundland to Northern Ireland </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > ON 147 </td><td class="highlighted"  colspan=1 rowspan=1 > MOEF group C4 </td><td colspan=1 rowspan=1 > 20-23 Nov 1942 </td><td colspan=1 rowspan=1 > Northern Ireland to Newfoundland </td></tr>
<tr> <td colspan=1 rowspan=1 > ON 146 </td><td colspan=1 rowspan=1 > MOEF group B3 </td><td colspan=1 rowspan=1 > 29 Nov-5 Dec 1942 </td><td colspan=1 rowspan=1 > Northern Ireland to Newfoundland </td></tr>
<tr> <td colspan=1 rowspan=1 > SC 127 </td><td colspan=1 rowspan=1 > WLEF </td><td colspan=1 rowspan=1 > 16–20 April 1943 </td><td colspan=1 rowspan=1 > Halifax to Newfoundland </td></tr>
<tr> <td colspan=1 rowspan=1 > ONS 4 </td><td colspan=1 rowspan=1 > WLEF </td><td colspan=1 rowspan=1 > 29 April-5 May 1943 </td><td colspan=1 rowspan=1 > Newfoundland to Halifax </td></tr>
<tr> <td colspan=1 rowspan=1 > HX 240 </td><td colspan=1 rowspan=1 > WLEF </td><td colspan=1 rowspan=1 > 21–25 May 1943 </td><td colspan=1 rowspan=1 > Halifax to Newfoundland </td></tr>
<tr> <td colspan=1 rowspan=1 > HX 242 </td><td colspan=1 rowspan=1 > MOEF group C2 </td><td colspan=1 rowspan=1 > 6–14 June 1943 </td><td colspan=1 rowspan=1 > Newfoundland to Northern Ireland </td></tr>
<tr> <td colspan=1 rowspan=1 > ON 190 </td><td colspan=1 rowspan=1 > MOEF group C2 </td><td colspan=1 rowspan=1 > 25 June-1 July 1943 </td><td colspan=1 rowspan=1 > Northern Ireland to Newfoundland </td></tr>
<tr> <td colspan=1 rowspan=1 > ONS 19 </td><td colspan=1 rowspan=1 > 9th escort group </td><td colspan=1 rowspan=1 > 27 Sept-9 Oct 1943 </td><td colspan=1 rowspan=1 >  </td></tr>
</table>
Question:
Which convoys did the USS Bancroft use to escort MOEF group C3, group C1, and  group C4?
Answer:
The USS Bancroft escorted convoy ON-121 with Escort Group C-3, convoy SC-99 with Escort Group C-1 and convoy ON-147 with Escort Group C-4.